Our recommendations are made independently through Research & Testing. We may receive commissions from purchases made via our links.

Oster French Door vs Cosori Air Fryer Toaster Oven Side-by-Side Comparison

Alan Nguyen
Reviewer
Nguyen Ntk
Visual Specialist
Updated

Oster French Door Toaster Oven

Cosori Air Fryer Toaster Oven

Tested Using Methodology v1.0
Updated Apr 3, 2023
Tested Using Methodology v1.0
Updated Apr 3, 2023
The front of a closed Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven. The control panel is positioned vertically on the right. Inside the oven are a shining light, two baking racks, and one baking pan.
The front of a closed Cosori CO130-AO 30L 12-In-1 Dehydrator Air Fryer Rotisserie Toaster Oven on a white background.

Our Verdict

6.5
Overall Score
  • Performance (50%)
    6.4/10
  • Design (25%)
    6.7/10
  • Usability (25%)
    6.4/10
8.4
Overall Score
  • Performance (50%)
    8.0/10
  • Design (25%)
    9.4/10
  • Usability (25%)
    8.3/10

Comparing the Oster French Door Digital Convection Toaster Oven (TSSTTVFDDG) to the Cosori Air Fryer Toaster Oven (CO130-AO) shows that size isn’t everything. The match is one-sided to say the least, but it does bring out the advantages that made the Cosori our definitive best-to-buy pick.

In terms of design, the Oster has a larger cooking chamber and an aesthetic french door, but that’s about it. It has less nichrome heating elements, less powerful convection system, less tray positions, and less accessories than the Cosori.

Usability-wise, the Cosori has a more informative digital display, better responsive buttons, more toggle switches, and an actually precise automatic preheat phase. To top it all off, the Cosori is cheaper than the Oster as well.

With all the stated advantages, it’s no surprise that the Cosori excelled at all of our cooking tests, including toasting bread, baking pizza, roasting a whole chicken, and air frying fries. Meanwhile, the Oster is only above average in three of them and lower in the fries test.

Medium Heat Only

Oster French Door Toaster Oven Performance

Performance
6.4
Performance Scores
  • Toast (40%)6.0/10
  • Pizza (25%)6.3/10
  • Whole Roasted Chicken (25%)8.1/10
  • Baked French Fries (10%)4.1/10
8.0
Performance Scores
  • Toast (40%)7.6/10
  • Pizza (25%)7.6/10
  • Whole Roasted Chicken (25%)8.9/10
  • Baked French Fries (10%)8.1/10
6.0

Toast

7.6
Oster French Door Toaster Oven Toast Test
From left to right, 24 pieces of toast for three toast levels including lighter, medium, and darker. On the upper row are the top sides, and on the lower row are the bottom sides of the toast.
The best four pieces of toast from the Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven. On the left are the top sides, and on the right are the bottom sides of the toast.
On the left are four pieces of toast from the first batch, and on the right are from the second batch. On the upper row are the top sides, and on the lower row are the bottom sides.
Taste: 6
50% * 6 = 3.0
Even Surface Color: 6
20% * 6 = 1.2
Consecutive Usability: 6
30% * 6 = 1.8
  • Function: Toast
  • Number Of Slices: 4
  • Toast Level: 4/6
  • Cooking Time: 7m 25s
  • Second Batch: 5m 31s
  • Convection: No

We began our Toast test on the Oster with the default toast level 4 and got pretty good results right off the bat. For good measure, we continued to try the toast level 3, which failed to color evenly within the stipulated time.

We then tried level 5 only to end up with burnt toast and not the expected deep brown shade. Regretfully, while level 4 was the best toast level, it didn’t score high on our benchmark scale—only 6/10.

On this setting—7 minutes 25 seconds on the timer—the four pieces of bread on the upper tray were toasted to a nice golden brown color. However, the color became dark towards the edges, especially where the bread was less dense.

Additionally, a large portion of the bottom right piece of toast was significantly lighter, possibly indicating a cold spot in the cooking chamber. With such unevenness, we could only score the surface color a 6/10 despite the overall golden brown hue.

Moreover, due to the lengthy toasting time, the toast became very crispy but dry on the inside. Our head chef, Tuyet Pham, said this crispiness would be great for eggs benedict and especially soup, but maybe not omelets and sandwiches. Unfortunately, the dark edges produced a bitter taste, preventing it from getting higher than a 6/10 from our chef.

We toasted the second batch of four slices immediately after the first. We chose level 4 again whereupon the oven automatically calibrated the timer to 5 minutes 31 seconds.

Since the oven was already hot, the aforementioned cold spot became less apparent. The toast was not as crispy nor dry as the first batch, which made it more suitable for sandwiches and omelets.

However, the burnt edges were still a problem, so the oven received one final 6/10 for consecutive usability. If you want better results for the second batch, we recommend decreasing the toast level by one.

Cosori Air Fryer Toaster Oven Toast test
Cosori Air Fryer Toaster Oven Toast From left to right, 24 pieces of toast for the top and bottom of three toast levels including lighter, medium, and darker.
The top and bottom of the best four pieces of toast from the Cosori CO130-AO 30L 12-In-1 Dehydrator Air Fryer Toaster Oven.
On the left are the top and bottom of four pieces of toast from the first batch, and on the right are from the second batch.
Taste: 8
50% * 8 = 4.0
Even Surface Color: 8
20% * 8 = 1.6
Consecutive Usability: 6.8
30% * 6.8 = 2.0
  • Function: Toast
  • Number Of Slices: 4
  • Toast Level: 2/7
  • Cooking Time: 5m 49s
  • Second Batch: 3m 50s
  • Convection: No

We started our Toast test with four pieces of white bread. We ran the toast function at level 3. The results were good, but the color was a bit too brown to be ideal. After examining the outcome on level 2, it was clear that was the best option, earning a score of 7.6/10 in total. We also tried toasting at level 1, which resulted in lightly toasted bread, for reference.

At level 2, which automatically set the timer for 5 minutes 49 seconds, the four pieces of toast mostly had a beautiful golden brown color. However, the existence of lighter areas, especially on the bottom side, kept it from being perfect. We considered it worthy of an 8/10 for even surface color.

The taste deserved another 8/10 thanks to the toast’s crispy surface and soft, moist interior. Our head chef, Tuyet Pham, determined the toast would complement pretty much anything, including sandwiches, omelets, eggs benedict, and soup.

After the first batch of toast, we immediately placed the second batch in the oven. The toast level 2 program automatically reduced the time to 3 minutes 50 seconds to account for the last batch’s residual heat.

However, this seemed like too much of a reduction, since the toast came out mostly lacking in color. It wasn’t very crispy either, so we could only give the oven a 6.8/10 for consecutive usability.

6.3

Pizza

7.6
Oster French Door Toaster Oven Pizza Test
A toaster oven baked 9-inch thick-crust meat pizza with cheese, onions, and green bell peppers on top. The pizza is inside a grooved silver baking pan on a white background.
Two slices of toaster oven baked pizza on top of one another. It’s a 9-inch thick-crust meat pizza with cheese, onions, and green bell peppers on top. The pizza is inside a grooved silver baking pan.
On a white background, two hands break apart a slice of baked pizza using a toaster oven with cheese, meat, and green bell peppers on top.
Cooking Time: 9
20% * 9 = 1.8
Crust: 5.5
20% * 5.5 = 1.1
Toppings: 6
30% * 6 = 1.8
Taste: 5.5
30% * 5.5 = 1.6
  • Function: Turbo Convection
  • Temperature: 450°F
  • Cooking Time: 6m
  • Convection: Yes

For this pizza test, we didn’t choose the oven’s 400°F pizza preset because it didn’t match our Pizza test requirement of 450°F. Instead, we chose Turbo Convection as a suitable setting for baking pizza. Nonetheless, the results were not so favorable scoring only 6.4/10 on our testing scale.

We were, however, impressed that the oven only took 9 minutes to bake a 9-inch thick-crust meat pizza placed on the upper rack level. According to our accumulated data on average toaster oven performance, this deserved a 9/10.

Unfortunately, the oven lacks the high-intensity heating capability needed to crisp a crust effectively in such a short period of time, which the Toshiba AC25CEW-BS has. Consequently, parts of the crust bottom stuck to the grooves of the baking tray and the surface had a light golden color - so the score was only 5.5/10.

We had to stop baking because some of the meat and parts of the cheese started charring. It was a shame that the cheese didn’t completely melt before this, so we could only give the toppings a 6/10.

We were able to prevent the toppings from burning and the potential bitter taste. However, the crust and the topping weren’t good enough for the taste of the pizza to get a score higher than 5.5/10 from our chef.

Cosori Air Fryer Toaster Oven Pizza test
Cosori Air Fryer Toaster Oven PizzaA toaster oven baked 9-inch thick-crust meat pizza with cheese, onions, and green bell peppers on top inside a baking pan.
Two slices of oven baked 9-inch thick-crust meat pizza with cheese, onions, and green bell peppers on top of one another.
Two hands break apart a slice of pizza with cheese, meat, onions, and green bell peppers on top baked using a toaster oven.
Cooking Time: 10
20% * 10 = 2.0
Crust: 7
20% * 7 = 1.4
Toppings: 7
30% * 7 = 2.1
Taste: 7
30% * 7 = 2.1
  • Function: Bake
  • Temperature: 450°F
  • Cooking Time: 3m 30s
  • Convection: Yes

The Cosori’s ability to maintain a high temperature really shined in our Pizza test, garnering a score of 7.6/10.

With a high power output and powerful convection system, it only took 3 minutes 30 seconds to bake a 9-inch thick-crust meat pizza placed on tray level 2. This was extremely fast and deserving of a 10/10, the same as the Cuisinart TOA-60 which has the current highest pizza score.

However, the short cooking time resulted in uneven heating in the pizza crust and toppings.

While the bottom right quarter of the crust was golden brown, the rest didn’t have much color. Only that well-cooked part was crispy while the rest was soft, so we gave the crust a 7/10.

The same happened to the toppings. The bottom right quarter had a lot of caramelization—to the point that the onions even charred—while the rest was only mildly caramelized. In addition, the cheese wasn’t very melty, so we gave the toppings a 7/10 as well.

Taste-wise, our chef said it would be better if it weren’t for the slight bitterness from the charred onions. She gave the pizza another 7/10.

8.1

Whole Roasted Chicken

8.9
Oster French Door Toaster Whole Roasted Chicken Test
A whole roasted chicken using a toaster oven on a white background. The chicken is belly up on a baking rack with a silver baking pan below.
A whole chicken roasted using a toaster oven on a baking rack with a silver baking pan below. The thermometer displays the same temperature of 181°F from two probes inserted into the right and left thighs of the chicken.
The roasted chicken is carved into ten pieces on a baking rack with a silver baking pan below. There are three pieces of the carcass, two wings, two thighs, two breast pieces, one drumstick, and two fallen leg bones.
Two hands pulling apart a juicy chicken thigh roasted in a toaster oven. In the white background is the rest of the roasted chicken on a baking rack with a silver baking pan below.
Cooking Time: 7
20% * 7 = 1.4
Skin: 7.5
20% * 7.5 = 1.5
Doneness: 9.8
20% * 9.8 = 2.0
Taste: 8
40% * 8 = 3.2
  • Function: Turbo Convection
  • Temperature: 350°F
  • Cooking Time: 1h 10m
  • Convection: Yes

The spacious interior of the Oster seemed a key factor in our Whole Roasted Chicken test, scoring an impressive 8.1/10. We placed a 3 lb chicken belly-up on the upper rack level and flipped it after the first 40 minutes.

After 1 hour and 10 minutes, the skin reached an acceptable roasted color scoring a 7/10 for cooking time. Our chef surmised that further roasting wouldn’t result in better skin caramelization. Thus, we stopped roasting to avoid overcooking the meat and inadvertently lowering the total score.

The skin had an appetizing golden color, except for the sides of the two drumsticks which were a little lighter in color. Compared to other benchmark tests, the skin only crisped slightly indicating the heating elements and convection system to be less than ideal/top-of-the-range. The results were good, enough for a 7.5/10.

In conclusion, the oven maintained an ideal temperature long enough to evenly cook an entire chicken throughout. We measured the internal temperature of the chicken and it was 181°F. This was very surprising and almost spot-on with the recommended 165°F - 180°F by the USDA—thus earning a whopping 9.8/10 for doneness.

Interestingly, the meat came out so tender that the bone simply fell off as we tried to carve the chicken. If the skin was crispier, the chicken would have received a higher than 8/10 for taste.

Cosori Air Fryer Toaster Oven Whole Roasted Chicken Test
A whole roasted rotisserie chicken using the Cosori CO130-AO Oven backside up on a grey baking pan on a white background.
A whole roasted rotisserie chicken using the Cosori CO130-AO Oven belly up on a grey baking pan on a white background.
A tray of whole toaster oven roasted chicken. The thermometer has two probes inside the chicken and displays 178°F and 181°F.
Two hands pulling apart a roasted chicken thigh from the carcass. In the white background is the rest of the roasted chicken.
Eight pieces of a carved chicken including two carcass halves, two breasts, two wings, and two thighs on a baking pan.
Cooking Time: 10
20% * 10 = 2.0
Skin: 8.5
20% * 8.5 = 1.7
Doneness: 9.9
20% * 9.9 = 2.0
Taste: 8
40% * 8 = 3.2
  • Function: Rotisserie
  • Temperature: 350°F
  • Cooking Time: 40m
  • Convection: Yes

We’ve conducted our Whole Roasted Chicken test a great many times, and the Cosori wasn’t the only one with a high power output and powerful convection system. What set it apart was its rotisserie kit and function.

In addition, the large cooking chamber had more than enough space for a 3 lb chicken to rotate smoothly with a baking pan below to catch the drippings, unlike the Instant Omni Plus 18L. Everything together scored a whopping 8.9/10.

The oven took only 40 minutes to roast the chicken to a beautiful color. That was the fastest time we’ve had so far, earning it a perfect 10/10. The skin was mostly golden with some appetizing golden-brown color at the wings and the tips.

However, it seemed like the skin cooked a bit too quickly and the fat wasn’t fully rendered, so the skin wasn’t very crispy. Nonetheless, the skin still deserved an 8.5/10.

What impressed us most was the near-perfect doneness—9.9/10—in such a short amount of time. The chicken had no pink spots and a consistent internal temperature of 178°F-181°F. It was basically spot-on to the USDA’s 165°F-180°F recommendation.

Unfortunately, for some reason, the meat wasn’t as juicy as we had expected. Combined with the less-than-crispy skin, our chef couldn’t give the chicken a higher score than 8/10 after tasting it.

4.1

Baked French Fries

8.1
Oster French Door Toaster Baked French Fries Test
Pieces of baked french fries using a toaster oven inside a silver grooved baking pan on a white background.
A closeup of pieces of baked french fries using a toaster oven inside a silver grooved baking pan.
Pieces of baked french fries using a toaster oven. Eight pieces of broken-up fries are stacked on top of pieces of whole fries inside a silver grooved baking pan.
Cooking Time: 0
20% * 0 = 0.0
Color: 5
20% * 5 = 1.0
Texture: 5.5
20% * 5.5 = 1.1
Taste: 5
40% * 5 = 2.0
  • Function: Turbo Convection
  • Temperature: 400°F
  • Cooking Time: 30 m
  • Convection: Yes

For our Baked French Fries test, the Oster was disappointing, scoring only 4.1/10. Our reasoning was the poor size ratio of the cooking chamber to the oven’s power output. The oven wasn’t able to maintain a high enough temperature for baking frozen fries, as opposed to the Ninja DT201.

After 30 minutes the fries showed no significant change in color—where the test time limit was 25 minutes! Therefore, we had no choice but to stop baking and give the fries a 0/10 for cooking time.

Most fries had a pale color as if they were air-dried instead of air-fried. Some small pieces had a light golden color, but that wasn’t enough to score higher than 5/10.

Texture-wise, the fries were soft but dry on the outside, barely enough for a 5.5/10. All things considered, the only silver lining was that the fries were cooked, so our chef gave them a 5/10 for taste.

Cosori Air Fryer Toaster Oven Baked French Fries test
Pieces of baked french fries using the Cosori CO130-AO inside an air fryer basket on a grey baking pan on a white background.
A close-up of pieces of baked french fries using the Cosori CO130-AO inside an air fryer basket on a grey baking pan.
Eight pieces of broken-up baked french fries are stacked on top of pieces of whole fries inside an air fryer basket.
Cooking Time: 8.4
20% * 8.4 = 1.7
Color: 8
20% * 8 = 1.6
Texture: 8
20% * 8 = 1.6
Taste: 8
40% * 8 = 3.2
  • Function: Bake
  • Temperature: 400°F
  • Cooking Time: 17m
  • Convection: Yes

The Cosori took on our Baked French Fries test with its air fryer basket and scored an 8.1/10.

It took 17 minutes to bake 12 oz of frozen fries on tray level 2—quite fast compared to most. After comparing it with other units from our data, we gave it an 8.4/10 for cooking time.

The fries mostly had a great golden color with some of the thinner pieces looking the most appetizing. However, some thicker pieces weren’t as golden, so we gave the fries an 8/10 for color.

The same can be said about the texture of the fries, which earned another 8/10. Most of the fries were crispy on the outside and moist on the inside, but the thinner ones were a bit dry and the thicker ones weren’t crispy enough.

Overall, though imperfect, the fries were delicious enough to get one final 8/10 taste score from our chef.

Aesthetic Only

Oster XL French Door Countertop Toaster Oven Design Review

Design
6.7
design Scores
  • Exterior (20%)8.0/10
  • Interior (30%)7.0/10
  • Build Quality (50%)6.0/10
9.4
design Scores
  • Exterior (20%)9.0/10
  • Interior (30%)9.5/10
  • Build Quality (50%)9.5/10

In the Oster TSSTTVFDDG Double-Door Convection Toaster Oven Box

In the Cosori CO130-AO Box
Top to bottom and left to right are a blue box, the Oster TSSTTVFDDG Toaster Oven, one baking rack, one baking rack with supports, a user manual, and a silver grooved baking pan on a white background.
  • Model: TSSTTVFDDG
  • Warranty: 1 year (US and Canada only)
  • User Manual
  • Baking Rack x 2
  • Baking Pan
  • Removable Crumb Tray

The Oster TSSTTVFDDG arrived boxed between two styrofoam brackets. The four accessories were packaged inside carton boxes and taped to the oven. While the box only has some basic information,  a complete user manual was inside.

A box, the Cosori CO130-AO, rotisserie kit and lifter, air fryer basket, baking pan, oven rack, and 6 pieces of documents.
  • Model: CO130-AO
  • Warranty: 1 year
  • User Manual
  • Baking Rack
  • Baking Pan
  • Broiling Rack
  • Removable Crumb Tray
  • Rotisserie Kit and Lifter
  • Air Fryer Basket

The Cosori toaster oven was packed between two foam pads while all six of its accessories were wrapped in carton sheets and taped to the oven. Everything comes in an aesthetically pleasing box with minimal information on it.

All the documents you’ll need are inside a nice envelope. You get a user manual, a recipe book, and some quick references. You’ll also find a QR code leading you to the manufacturer’s website where you can register your product to extend your warranty by an additional year.

8.0

Exterior

9.0
An closed front of the Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven on a white background. The exterior is 16.75 inches long, 21.53 inches wide, and 12.79 inches high.
An closed front of the Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven on a white background. The exterior is 16.75 inches long, 21.53 inches wide, and 12.79 inches high.
The front and the right sides of a closed Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven on a white background. The control panel is in the front. The right side has air ventilation holes.
On a white background, the back and the left sides of a closed stainless steel Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven both have air ventilation holes. The back side has a black buffer.
On a white background, the top and the right sides of a closed stainless steel Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven both have air ventilation holes. The control panel is in the front.
On a white background, the bottom of a closed stainless steel Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven has four base stands and ventilation holes. The control panel is in the front.
  • Weight:
    16.8 lbs (7.6 kg)
  • Length:
    21.5" (54.7 cm)
  • Width:
    20.0" (50.7 cm)
  • Height:
    12.8" (32.5 cm)
  • Material:
    Stainless steel
  • Color:
    Silver
  • Door Handle:
    Cool-touch
  • Tray Indicators:
    No
  • Crumb Tray:
    Removable

Considering the Oster’s large size, ventilation slats on all sides are a big plus. (+3). At first glance, the most stand-out feature was the tempered glass french door with cool-touch door handles (+3).

It has a rear buffer to maintain a cool distance from the wall, but we thought it could be greater(+2). Additionally, while the oven’s leg stoppers are sturdy, they are rather small.

Our measurements of the oven’s footprints were 21.53" x 19.96" x 12.79" which matched closely with the manufacturer’s 22" x 19.5" x 13". On a side note, we weighed the oven and it was 16.75 lbs while the manufacturer stated the entire package to be 13.87 lbs.

Cosori Air Fryer Toaster Oven ExteriorThe front of a closed Cosori CO130-AO 30L 12-In-1 Toaster Oven has a control panel and the right has ventilation holes.
Cosori Air Fryer Toaster Oven ExteriorThe front of a closed Cosori CO130-AO 30L 12-In-1 Toaster Oven has a control panel and the right has ventilation holes.
The back and left sides of the Cosori CO130-AO 30L 12-In-1 Toaster Oven have air ventilation holes. The back has a buffer.
On a white background, the top, front, and right sides of the Cosori CO130-AO Toaster Oven have air ventilation holes.
On a white background, the bottom of the Cosori CO130-AO Oven has a power cord, four stands, and air ventilation holes.
A closed front of the Cosori CO130-AO 30L 12-In-1 Air Fryer Toaster Oven with exterior measurements on a white background.
  • Weight:
    15.7 lbs (7.1 kg)
  • Length:
    20.0" (50.7 cm)
  • Width:
    17.3" (44.0 cm)
  • Height:
    12.6" (32.0 cm)
  • Material:
    Stainless steel
  • Color:
    Silver
  • Door Handle:
    Cool-touch
  • Tray Indicators:
    No
  • Crumb Tray:
    Removable

During our assessment, a prominent aspect of the Cosori toaster oven is the air ventilation holes on all sides of the casing to accommodate its powerful convection system. In addition, the glass door has indicators corresponding to the oven’s three tray levels and twelve cooking functions.

The oven doesn’t have carrying handles but it’s not heavy for its size so it’s not a big problem. Our measurements of 19.96" x 17.32" x 12.6" pretty much aligned with the manufacturer’s 20.1" x 16.5" x 12.5" with marginal differences being less than one inch. The difference in width is probably because we took the door handle into account.

Control Panel

The control panel of the Oster TSSTTVFDDG Toaster Oven has an LCD and 15 flat buttons for Toast, Bake, Broil, Turbo Convection, Pizza, Warm, Defrost, Dehydrate, Timer, Temp, Clock, Stop/Cancel, and Start.
  • Type:
    LCD + 15 buttons
  • Temperature:
    150°F - 450°F
  • Timer:
    1 minute - 6 hours
  • Indicator Light:
    No
  • Status Bar:
    No
  • Light Toggle:
    No
  • Convection Toggle:
    No
  • Rotation Toggle:
    No
  • Automatic Preheat:
    Yes
  • Audio Cues:
    No

The Oster has an LCD and 15 flat buttons including 8 for functions, 2 for timer adjustment, 2 for temperature adjustment, a Clock button, a Stop/Cancel button, and a Start button. The oven has an automatic interior light with no toggle button.

Cosori Air Fryer Toaster Oven Control Panel
  • Type:
    LED display + 2 control knobs + 3 buttons
  • Temperature:
    80°F - 450°F
  • Timer:
    1 minute - 6 hours + 12 hours + 24 hours
  • Indicator Light:
    Yes
  • Status Bar:
    Yes
  • Light Toggle:
    Yes
  • Convection Toggle:
    Yes
  • Rotation Toggle:
    No
  • Automatic Preheat:
    Yes
  • Audio Cues:
    No

The Cosori Air Fryer Toaster Oven has 2 control dials, one for functions and one for both timer and temperature. It also has 3 buttons, one for both the interior light and the temperature conversion, one to deploy the convection system, and one Start/Cancel button which lights up when the oven is running.

The LED screen will display ‘E1’ when there’s an open circuit in the temperature monitor and ‘E2’ for a short circuit.

Cooking Functions of the Oster XL Digital Convection Toaster Oven

Cooking Functions
The eight cooking functions of the Oster TSSTTVFDDG Toaster Oven are in the center of the control panel. They include Toast, Bake, Broil, Turbo Convection, Pizza, Warm, Defrost, and Dehydrate. The oven’s right side has air ventilation holes.
  • Toast (level 1-6)
  • Bake (150°F-450°F)
  • Turbo Convection (150°F-450°F)
  • Broil (450°F)
  • Pizza (400°F)
  • Warm (150°F)
  • Defrost (150°F)
  • Dehydrate (150°F)

The Oster has eight cooking functions including Toast, Bake, Broil, Pizza, Warm, Defrost, Dehydrate, and Turbo Convection. Despite the name, Turbo Convection is basically Convection Bake—meaning this oven only has one convection level.

The standard Bake function and ‘Turbo’ Convection operate in the oven’s maximum temperature range, between 150°F to 450°F. The Toast function has 6 preset levels from Light to Dark, Meanwhile, the Pizza function is set to 400°F and Broil to 450°F—meaning neither can be adjusted.

The user manual recommends not to preheat the oven when using Defrost and Dehydrate. These two functions are set to 150°F—the lowest possible temperature —and cannot be adjusted. However, 150°F is a bit high compared to common dehydrators which operate at around 100°F.

For some reason, we couldn’t find the set temperature for Warm in the manual, but we measured the temperature to be 150°F.

  • Toast (level 1-7)
  • Bagel (level 1-7)
  • Pizza (150°F - 450°F, 1 minute - 6 hours)
  • Bake (150°F - 450°F, 1 minute - 6 hours)
  • Roast (150°F - 400°F, 1 minute - 6 hours)
  • Air Fry (150°F - 400°F, 1 minute - 6 hours)
  • Broil (150°F - 450°F, 1 minute - 6 hours)
  • Cookies (150°F - 450°F, 1 minute - 6 hours)
  • Rotisserie (150°F - 400°F, 1 minute - 6 hours)
  • Dehydrate (100°F - 180°F, 30 minutes - 24 hours)
  • Ferment (80°F - 110°F, 30 minutes - 12 hours)
  • Warm (140°F - 230°F, 1 minute - 12 hours)

Besides the basic cooking functions, which already have a wide time and temperature range, the Cosori air fryer toaster oven also has various practical additional cooking functions allowing for even wider time and temperature ranges.

The ones that impressed us the most were Warm, Dehydrate, and Ferment which can maintain the oven at as low as 140°F, 100°F, and 80°F respectively. Looking at a number of recipes, these temperatures fit their intended purpose, which means this oven can act as a family-sized dehydrator and dough proofer.

Note that only the bottom heating elements operate during these functions.

7.0

Interior

9.5
The cooking chamber of the Oster TSSTTVFDDG Toaster Oven has one nichrome heating element on top and two on the bottom, two rack levels, a shining light, and a fan cavity on the right wall.
The cooking chamber of the Oster TSSTTVFDDG Toaster Oven has one nichrome heating element on top and two on the bottom, two rack levels, a shining light, and a fan cavity on the right wall.
The cooking chamber of the Oster TSSTTVFDDG Toaster Oven has one bent nichrome heating element on top and two straight ones on the bottom, two rack levels, a light, and a fan cavity on the right wall.
Two assembled guide rails on the right side of the Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven’s cooking chamber. A fan cavity is in between the two rails.
  • Heating Elements:
    3 nichrome
  • Convection Fan:
    Yes
  • Lighting:
    Yes
  • Tray Levels:
    2
  • Rotisserie:
    No
  • Safety Hook:
    No

The Oster uses three nichrome heating elements with an unusual looped design for the upper heating element (+3). Most similar large-capacity ovens we have examined have four upper heating elements, two bottom heating elements, and a combined power draw of 1800 W.

However, the Oster has only one upper heating element which bends across and around the cooking chamber’s ceiling to cover the same area as would four. Since the power draw is divided equally between working heating elements, we speculated this design choice was to accommodate the oven’s lower power draw of 1500 W.

The TSSTTVFDDG claims to have ‘easy clean interior walls’. While they are not grease-proof, our cleaning test showed that the oven was, indeed, easy to clean (+1).

The convection fan is situated on the right side of the cooking chamber (+2). While the oven has an interior light, it’s fully automatic with no manual operation (+2).

Having only two rack levels, the oven doesn’t really require guides on the glass door (-1). The manual recommends using the upper rack position for toast and pizza, and the lower one for other foods. It’s worth noting that the rack guide rails are assembled parts and not hollowed out of the cooking chamber’s walls like many other toaster ovens.

The baking rack should not be slid into the lower rack slot with the baking tray attached to the bottom. This will result in direct contact with the bottom heating elements.

The Cosori CO130-AO’s interior has 4 heating elements, 3 levels, a rotisserie socket and bracket, a light, and a fan cavity.
The Cosori CO130-AO’s interior has 4 heating elements, 3 levels, a rotisserie socket and bracket, a light, and a fan cavity.
The Cosori CO130-AO Oven has 4 heating elements, 3 guide rails, and a rotisserie socket on its left cooking chamber wall.
The Cosori CO130-AO has 3 guide rails, a light, a rotisserie bracket, and a fan cavity on its right cooking chamber wall.
  • Heating Elements:
    4 nichrome
  • Convection Fan:
    Yes
  • Lighting:
    Yes
  • Tray Levels:
    3
  • Rotisserie:
    Yes
  • Safety Hook:
    No

The interior features include a convection fan, light, a rotisserie socket and bracket, three tray levels, and four nichrome heating elements. To be nitpicky, we think it’s a shame it doesn’t have a non-stick coating, so it may accumulate some stubborn stains.

Capacity of the Oster Double Door Oven

Capacity of the Cosori XL 12-In-1 Air Fryer Toaster Oven
An opened front of the Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven on a white background. The cooking chamber is 15.75 inches long, 16.53 inches wide, and 10.04 inches high.
  • Length:
    15.8" (40.0 cm)
  • Width:
    16.5" (42.0 cm)
  • Height:
    10.0" (25.5 cm)

According to the manufacturer, the TSSTTVFDDG can take 14 slices of toast and two 16-inch pizzas on its two racks. However, our hands-on testing proved it fits only 12 slices (6 per rack, each requiring at least 4.5 x 4.5 inches of space)  or a 15-inch pizza. While it wasn’t clear what the maximum size for a whole chicken was, our tests indicated plenty of room for a 3 lb bird.

The manufacturer doesn’t state the interior capacity, but we measured the cooking chamber volume to be around 42.83 liters—our biggest number to date. However, we felt only two rack slots didn’t do justice to the oven’s capacity.

An opened front of the Cosori CO130-AO 30L 12-In-1 Rotisserie Toaster Oven with interior measurements on a white background.
  • Length:
    14.2" (36.0 cm)
  • Width:
    13.8" (35.0 cm)
  • Height:
    9.8" (25.0 cm)

The Cosori has a spacious cooking chamber even compared to other large ovens. It can accommodate 6 slices of toast, a 13-inch pizza, or a 5-pound chicken.

We measured the volume to be around 31.49 liters compared to the manufacturer’s listing of 30 liters. The difference is minor and could just be a difference in measuring standards.

Power Cord

A two-pronged plug power cord. In the background is the Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven.
  • Length:
    25.8" (65.5 cm)
  • Type:
    2-prong plug
  • Power:
    1500 W
  • Rated Output:
    120 V ~ 60 Hz

The power cord is 25.79" long which is enough for household use. However, it could be a bit longer since a toaster oven as large as the Oster requires at least 5 inches of clear space on all sides. The oven doesn’t have storage space for the cord like some ovens do.

A three-pronged plug power cord. In the background is the Cosori CO130-AO 30L Dehydrator Air Fryer Rotisserie Toaster Oven.
  • Length:
    40.9" (104.0 cm)
  • Type:
    3-prong plug
  • Power:
    1800 W
  • Rated Output:
    120 V ~ 60 Hz

The power cord has plenty of length for household use—roughly 40.94 inches. It protrudes from the bottom of the oven, unfortunately, so it may create awkward kinks now and then.

Baking Rack x 2

Accessories

Baking Rack
A stainless steel baking rack with two supports below of the Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven on a white background.
A stainless steel baking rack with two supports below of the Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven on a white background.
A stainless steel baking rack of the Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven on a white background.
  • Length:
    15.7" (39.8 cm)
  • Width:
    16.1" (41.0 cm)
  • Height:
    0.7" (1.8 cm)
  • Material:
    Stainless steel
  • Dishwasher Safe:
    Yes

The Oster has two slightly different baking racks. One is the standard rack type, while the other has two supports below to slide the baking pan under.

A stainless steel baking rack of the Cosori CO130-AO 30L 12-In-1 Dehydrator Rotisserie Toaster Oven on a white background.
  • Length:
    14.2" (36.0 cm)
  • Width:
    13.4" (34.0 cm)
  • Height:
    0.3" (0.7 cm)
  • Material:
    Stainless steel
  • Dishwasher Safe:
    Yes

The baking rack fits perfectly onto its guide rails to prevent accidents when placing food in the oven. It’s also shaped to maximize the space inside the cooking chamber.

Baking Pan

Accessories

Baking Pan
A silver baking pan of the Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven on a white background.
  • Length:
    14.13
  • Width:
    11.8" (30.0 cm)
  • Height:
    1.1" (2.9 cm)
  • Material:
    Stainless steel
  • Dishwasher Safe:
    Not advisable

The baking pan has ridges and grooves for creating attractive roast markings and catching drippings. It also has wide edges for a firm fit on the baking rack supports, unlike some other designs we’ve seen.

However, it’s not big enough to fit into the rack rail guides and can only go on top of a rack or attached beneath. This means it doesn’t make full use of the oven’s capacity. In addition, the tray is coated, but not completely non-stick so prone to stubborn stains.

A grooved grey baking pan of the Cosori CO130-AO 30L 12-In-1 Dehydrator Rotisserie Toaster Oven on a white background.
  • Length:
    14.2" (36.0 cm)
  • Width:
    11.8" (30.0 cm)
  • Height:
    1.2" (3.0 cm)
  • Material:
    Stainless steel
  • Dishwasher Safe:
    Yes

The baking pan also fits the guide rails to fully utilize the cooking space. It has ridges and grooves which can give your food attractive roasting marks and allow drippings some space to flow away. Its coating isn’t completely non-stick, so it may gather some stubborn stains, though.

Removable Crumb Tray

Accessories

Removable Crumb Tray
A stainless steel removable crumb tray of the Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven on a white background.
  • Length:
    15.7" (39.8 cm)
  • Width:
    12.5" (31.8 cm)
  • Height:
    0.8" (1.9 cm)
  • Material:
    Stainless steel
  • Dishwasher Safe:
    Not advisable

A crumb tray is always a useful accessory to clean up pesky debris, especially with a large toaster oven like the Oster. Look out for crumbs falling onto the oven floor as you take out the tray. It’s quite a hassle to tilt the oven to get them out.

A silver removable crumb tray of the Cosori CO130-AO 30L 12-In-1 Dehydrator Rotisserie Toaster Oven on a white background.
  • Length:
    14.0" (35.6 cm)
  • Width:
    12.0" (30.5 cm)
  • Height:
    0.8" (2.0 cm)
  • Material:
    Stainless steel
  • Dishwasher Safe:
    Not advisable

The crumb tray is a helpful accessory to clean up the pesky falling crumbs and bits. However, some may still fall to the oven’s floor as the tray is removed.

6.0

Build Quality

9.5
An opened Oster TSSTTVFDDG XL Digital French Door Toaster Oven on a white background. Inside the cooking chamber, from the bottom up are one removable crumb tray, one baking rack, and one baking pan under another baking rack.

The TSSTTVFDDG is light for its size and has a graspable rectangular shape making it easy to carry or position on a counter (+2). It also has a sturdy build and durable stainless steel casing (+4). The LCD is black while the numbers are yellow and the settings are red, making everything easy to see (+1).

Unfortunately,  we found that the flat buttons often required some force to register (-1). Moreover, the door hinge could be firmer thus preventing the door from slamming shut.

The front of an opened Cosori CO130-AO Toaster Oven with a removable crumb tray, oven rack, baking pan, and air fryer basket.

The Cosori is made from high-quality and durable 304 stainless steel. The thick casing provides good insulation in addition to a well-thought-out convection system. Thus, the oven only gets hot to the touch after a long cooking time at a high temperature (>400°F).

As for the control panel, the LED display is very easy to see, the control dials turn smoothly, and the buttons are responsive. The accessories are designed to make the most out of the cooking chamber’s interior space.

Could Be Improved

Oster TSSTTVFDDG Digital French Door Toaster Oven Usability

Usability
6.4
usability Scores
  • User Control (30%)8.0/10
  • Oster French Door Toaster Oven Ease of Use (50%)5.0/10
  • Cleanability (20%)7.5/10
8.3
usability Scores
  • User Control (30%)9.5/10
  • Ease of Use (50%)8.0/10
  • Cleanability (20%)7.5/10
8.0

User Control

9.5

The Oster’s controls are easy to understand since what you see is what you get (+2). Therefore, the LCD doesn’t provide any extra information but it’s easy to read (+2).

The buttons have only a single function and are easy to tell apart(+2). Although the manual says you can press the Stop/Cancel button twice to turn off the oven, we weren’t able to do so (-1).

The temperature can be adjusted in increments of 5°F and the timer runs from one minute to six hours, which is quite impressive (+1). Time can be adjusted in increments of 1 minute up to  2 hours and in increments of 0.5 hours above 2 hours (+1).

To set up the clock, press the clock button once and the clock will flash. Then, use the arrow keys to set the hour and press the clock button again to likewise set the minutes. Finally, push the clock button or the start button to set the time (+1).

The convection feature can toggle between normal and high, and neither setting makes much noise. The fan can run on all functions except Toast and Bagel.

Since time and temperature are controlled by a single dial, you must toggle between functions. Press the dial’s face to switch between them. Temperature can be adjusted in increments of 5°F or 2°C-3°C.

The timer, however, has different steps depending on the cooking function. For Pizza, Bake, Roast, Air Fry, Broil, Cookies, Rotisserie, and Warm functions, the timer can be adjusted in increments of 1 minute until it reaches 60 minutes, then in increments of 5 minutes from 1-2 hours, in increments of 10 minutes from 2-3 hours, and in increments of 15 minutes from 2-3 hours. For Dehydrate and Ferment functions, the timer only adjusts in increments of 30 minutes.

On top of the many practical cooking functions, the ease with which you can adjust time and temperature makes this oven, overall, simpler to use than many other digital ones. In addition, you can press and hold the time and temperature dial to turn off the display to save energy while you’re not cooking.

5.0

Oster French Door Toaster Oven Ease of Use

Ease of Use

As you select a function, the corresponding icons will illuminate in the LCD screen. The TSSTTVFDDG has an automatic preheat phase which is only applicable for the Bake and Turbo Convection Bake functions (+1).

After setting the time and temperature, you then push start and the display will show PrE indicating the oven is in the preheating phase. You can bypass this phase by pressing the start button a second time.

Preheating takes roughly 5 minutes to around 300°F regardless of the  temperature you set. You can readjust the time and temperature only after the preheating phase.

Interestingly, we found that the oven would return to preheat mode after adjusting the temperature until the new input temperature was reached and not just 300°F. This is also stated in the user manual.

The racks fit perfectly into the rail guides thus preventing accidents when placing food in the oven (+3). When the cooking cycle begins, the interior light will turn on automatically and then off when the cooking cycle ends (+2).

The french door and its cool-touch handle allow you to stay away from the heat wave when opening after cooking (+4). The doors are also single-pull which is very convenient. However, the doors cannot open partially and can slam shut if your hand slips (-2).

Unlike some ovens, opening the door doesn’t stop the oven or the interior light (-2). The oven casing can get very hot after long cooking times at high temperatures, so you should take care (-1).

When the cooking cycle finishes, the oven will beep once, switch off the heat, and return to the clock screen. It’s advised to unplug the oven after use.

The Cosori has an automatic preheat phase which engages for the Pizza, Bake, Roast, Broil, Cookies, and Air Fryer functions. If the oven’s already hot, the function will recognize that fact and reduce its preheating time.

This toaster oven is one of the rare units that actually preheat to the input temperature. Most others simply heat to a hardwired preheat temperature that cannot be adjusted. 

According to our observation, the Cosori takes around 2-4 minutes to reach 300°F, 3-5 minutes for 325°F, 4-6 minutes for 350°F, and 6-8 minutes for 400°F. When preheating is finished, the oven will beep several times and the display will flash once every minute. You’ll need to press start to initiate cooking or the cooking function will be canceled after 10 minutes.

Thanks to the light toggle button, you have full control over when to turn the light on and off. The door can rest open at a 70° angle to allow food to cool inside the oven. Opening the door doesn’t stop the heating elements or the interior light.

The oven turns off automatically after 30 minutes of no interaction. Nonetheless, we still suggest unplugging it after use for safety reasons.

The Cosori’s EvenRapid Tech™ is advertised to reduce cooking time by 30% thanks to increased heat circulation. Suffice to say, it met our expectations with fast cooking times and even surface caramelization (except on our Pizza test).

7.5

Cleanability

7.5
A silver baking pan of the Oster TSSTTVFDDG XL Digital French Door Convection Toaster Oven with some stains on it on a white background.

The stainless steel exterior of the Oster was very easy to clean (+2). Even though the interior doesn’t have a non-stick coating, there are no tricky nooks and crannies, so cleaning didn’t require much labor (+4).

After roasting a chicken, the baking pan accumulated some stubborn stains which we were able to remove even with a baking soda paste and water (+1.5). We were worried the grease could splash inside the fan cavity while cooking, but this was not the case.

Cosori Air Fryer Toaster Oven CleanabilityGrease on the Cosori CO130-AO 30L 12-In-1 Dehydrator Air Fryer Rotisserie Toaster Oven’s cooking chamber ceiling.
Cosori Air Fryer Toaster Oven CleanabilityGrease on the Cosori CO130-AO 30L 12-In-1 Dehydrator Air Fryer Rotisserie Toaster Oven’s cooking chamber ceiling.
The cleaned cooking chamber’s right wall of the Cosori CO130-AO Toaster Oven with some stains behind the rotisserie bracket.
The cleaned grooved grey baking pan of the Cosori CO130-AO 30L 12-In-1 Air Fryer Toaster Oven with some stubborn stains.
The cleaned rotisserie forks of the Cosori CO130-AO 30L 12-In-1 Dehydrator Air Fryer Toaster Oven with some stubborn stains.

The Cosori’s exterior and interior are made of stainless steel, so they’re usually easy to clean. However, the interior doesn’t have a non-stick coating, so the grease from our whole roasted chicken test led to some extremely stubborn stains on the cooking chamber’s ceiling. We couldn’t completely remove them even after brushing them with a paste of baking soda and water.

The rotisserie forks and rod as well as the rotisserie bracket and the baking pan developed equally stubborn stains. On the bright side, it wasn’t difficult to clean caramelized bits of food from the air fryer basket despite the fishnet design.

The grease on the other walls and around the fan cavity was easy to clean. We were worried that grease might splash into the fan cavity, though.

We were able to easily remove fallen food scraps thanks to the removable crumb tray. However, we still had to tilt the oven to get them all out.