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Mueller 4 Slice vs Oster 6 Slice Convection Toaster Oven Side-by-Side Comparison

Alan Nguyen
Reviewer
Nguyen Ntk
Visual Specialist
Updated
Tested Using Methodology v1.0
Updated Apr 3, 2023
Tested Using Methodology v1.0
Updated Mar 19, 2023
The front of a closed stainless steel Mueller MT-175 4-Slice Countertop Toaster Oven on a white background.
The front of a closed stainless steel Oster TSSTTVMNDG-SHP-2 6-Slice Digital Convection Toaster Oven on a white background.

Our Verdict

6.1
Overall Score
  • Performance (50%)
    7.0/10
  • Design (25%)
    5.3/10
  • Usability (25%)
    5.2/10
6.7
Overall Score
  • Performance (50%)
    7.0/10
  • Design (25%)
    6.2/10
  • Usability (25%)
    6.6/10

Comparing the Mueller 4 Slice (MT-175) to the Oster 6 Slice Convection Toaster Oven (TSSTTVMNDG-SHP-2) brings out some of their interesting strengths and weaknesses. As a small and a large unit respectively, their overall scores don’t differ as much as their sizes.

In terms of design features, the Mueller lacks the convection system and interior light that the Oster has. It does, however, have a detachable crumb tray that’s more suitable for a small unit whereas the Oster has a slide-out one. The Mueller’s analog control dials are precise but the oven doesn’t display the exact timer and temperature like the Oster.

The most impressive aspect about the Mueller is its performance, tying with the Oster and boosting its overall score all the way up. The Mueller was actually better at toasting bread—our most crucial performance test—despite a lower power output.

The Oster was better at baking pizza, roasting whole chicken, and baking fries thanks to its convection system and higher power draw. Regardless, the Mueller didn’t fall too far behind in the pizza and chicken tests.

Good Heat Distribution

Mueller 4-Slice Toaster Oven Performance

Oster TSSTTVMNDG-SHP-2 6-Slice Convection Toaster Oven Performance
7.0
Performance Scores
  • Toast (40%)7.5/10
  • Pizza (25%)7.6/10
  • Whole Roasted Chicken (25%)7.0/10
  • Baked French Fries (10%)3.6/10
7.0
Performance Scores
  • Toast (40%)6.2/10
  • Pizza (25%)8.0/10
  • Whole Roasted Chicken (25%)7.8/10
  • Baked French Fries (10%)6.0/10
7.5

Toast

6.2
Mueller 4 Slice Toaster Oven Toast Test
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 stainless steel Mueller MT-175 4-Slice Countertop 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: 7
20% * 7 = 1.4
Consecutive Usability: 7
30% * 7 = 2.1
  • Function: Toast
  • Number Of Slices: 4
  • Toast Level: ⅓ to Dark
  • Cooking Time: 4m
  • Second Batch: 4m
  • Convection: No

For our Toast test, we started off by trying the Medium Toast setting which was around 3 minutes 5 seconds on the timer. The four pieces of bread on the upper tray level came out only lightly toasted on top except for one golden brown piece. We then cranked it up to the Dark Toast setting—around 4 minutes 50 seconds on the timer—which, unfortunately, burnt the toast a bit.

Finally, we opted for the middle ground which was 4 minutes on the timer—⅓ of the rotation from Medium to Dark. This setting was tricky to get right on the time dial, so we used an external timer. It gave us the best possible toast results from this oven scoring a 7.5/10 in total.

After 4 minutes of toasting, the four pieces of toast had pretty good surface color. However, the colors varied from light golden to golden brown on both the top and the bottom, so we could only give a 7/10.

Luckily, the varied colors partially meant varied textures which were all good and deserving an 8/10. The golden brown areas had a more crispy outside while the light golden areas had a softer inside. Our head chef Tuyet Pham determined that it would go great with omelets, eggs benedict, and sandwiches but not so much with soup.

After taking out the first batch, we immediately put four more pieces inside to test the oven’s consecutive usability which ended up at 7/10. Also under the identical toasting time, the four pieces of bread became brown with an increased evenness from the first batch. While the color was a bit darker than ideal, the extra crispiness made the second batch more suitable for soups.

Oster TSSTTVMNDG-SHP-2 ToastFrom left to right, 24 pieces of toast for the top and bottom of three toast levels including lighter, medium, and darker.
On the left: Level 1; In the middle: Level 2; On the right: Level 3
Oster TSSTTVMNDG-SHP-2 ToastFrom 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 Oster TSSTTVMNDG-SHP-2 6-Slice Digital Convection 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: 7
50% * 7 = 3.5
Even Surface Color: 6
20% * 6 = 1.2
Consecutive Usability: 5
30% * 5 = 1.5
  • Function: Toast
  • Number Of Slices: 4
  • Toast Level: 2/6
  • Cooking Time: 6m 43s
  • Second Batch: 4m18
  • Convection: No

Using the steps of our Toast test, we determined that level 2—6 minutes 43 seconds on the timer—was the best option, scoring a 6.2/10. In comparison, the toast at level 1 had a very light color, and the toast at level 3 had a dark brown color, with some dark patches.

The Toast Level 2 of the Oster produced four pieces with a golden brown color on the top. However, due to the unideal tray position, the toast was dark brown on the bottom. Even though the color was even, the big difference between the top and bottom resulted in a 6/10.

Due to the long cooking time, the first batch of toast was crispy outside but a bit dry inside, so it got a 7/10 for taste. Our head chef, Tuyet Pham, determined they would go well with eggs benedict, omelet, and soup, in particular, but not with sandwiches.

Even though this oven automatically deducted the toast timer to 4m 18s, the second batch was still significantly darker and drier. The color was also uneven, ranging from golden brown to dark, so it got a 5/10 for consecutive usability.

7.6

Pizza

8.0
Mueller 4 Slice Toaster Oven Pizza Test
 Mueller 4 Slice 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: 6
20% * 6 = 1.2
Crust: 8
20% * 8 = 1.6
Toppings: 8
30% * 8 = 2.4
Taste: 8
30% * 8 = 2.4
  • Function: Toast
  • Temperature: 450°F
  • Cooking Time: 9m
  • Convection: No

For its low power draw, the Mueller did pretty well in our Pizza test with a score of 7.6/10.

The oven took 9 minutes to bake a 9-inch thick-crust meat pizza which was slightly faster than the label’s recommended 10 minutes. However, compared to our tested toaster ovens, it could only be a 6/10.

The crust had a golden color all the way through and the inside was still moist. If only the crust was a bit more crispy, it would’ve gotten higher than an 8/10.

The toppings were also caramelized quite evenly from the meat and veggies to the cheese, worthy of another 8/10. The cheese was nicely melted but the areas closer to the back of the cooking chamber were more caramelized compared to the rest.

With both the crust and the toppings being 8/10, our chef had no reason to give the pizza one final 8/10 for taste.

A toaster oven baked 9-inch thick-crust meat pizza with cheese, onions, and green bell peppers on top inside a baking pan.
A 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 melty cheese, meat, and green bell peppers on top baked using a toaster oven.
Cooking Time: 8.2
20% * 8.2 = 1.6
Crust: 8
20% * 8 = 1.6
Toppings: 8
30% * 8 = 2.4
Taste: 8
30% * 8 = 2.4
  • Function: Bake
  • Temperature: 450°F
  • Cooking Time: 6m 50s
  • Convection: Yes

The Oster did very well in baking a 9-inch thick-crust meat pizza, but the evenness in caramelization could be improved. Thus, it received an 8/10 in total.

It only took 6m 50s to bake the pizza as opposed to 10 minutes on the label. In comparison to other toaster ovens in our Pizza test, it got a solid 8.2/10.

The crust had a nice golden brown color and since it was neither too soft nor too dry, it scored an 8/10. The cheese was melty and the toppings’ caramelization was about 80% even, so we gave it another 8/10. For its taste, our chef gave the pizza one final 8/10.

7.0

Whole Roasted Chicken

7.8
Mueller 4 Slice Toaster Oven Whole Roasted Chicken Test
A whole roasted chicken using the Mueller MT-175 Toaster Oven backside up on a silver baking pan on a white background.
A whole roasted chicken using the Mueller MT-175 Toaster Oven belly up on a silver baking pan on a white background.
A tray of whole toaster oven roasted chicken. The thermometer has two probes inside the chicken and displays 185°F and 192°F.
Eight pieces of a carved chicken including two carcass halves, two breasts, two wings, and two thighs on a baking pan.
Two hands pulling apart a roasted chicken thigh. In the white background is the rest of the roasted chicken on a baking pan.
Cooking Time: 6
20% * 6 = 1.2
Skin: 5.5
20% * 5.5 = 1.1
Doneness: 8.7
20% * 8.7 = 1.7
Taste: 7.5
40% * 7.5 = 3.0
  • Function: Toast
  • Temperature: 350°F
  • Cooking Time: 1h 20m
  • Convection: No

The Mueller could barely fit a 3 lb chicken for our Whole Roasted Chicken test. Nonetheless, the result was quite decent at 7/10 in total. If you were to purchase this oven and use it to roast a whole chicken, we recommend cutting it open or chopping it into pieces beforehand.

We first placed the chicken backside down on the baking pan. When we slid the pan in, the top of the chicken breast grazed the upper heating element’s guard and was seared.

After the first 40 minutes, we flipped the chicken to find out that parts of the skin on the back got stuck to the baking pan. Then, when we reinsert the pan, the same problem with the breast happened to the back. Luckily, they weren’t burnt.

However, even after 1 hour and 20 minutes, most of the chicken skin still hasn’t reached a desirable color. The chicken, for the most part, looked like it was steamed and not roasted, so we gave the skin a 5.5/10.

Nonetheless, our chef decided to stop the roasting as the color wouldn’t improve anyway and to avoid overcooking the meat. This cooking time was the equivalent of a 6/10 according to our data.

With such a long cooking time, the meat had no pink spots. However, the chicken’s internal temperature was 185°F-192°F, higher than the USDA recommended 165°F-180°F. Thus, we gave it an 8.7/ for doneness.

While not the most appetizing looking, the meat was very juicy. That, combined with the slight caramelization on the skin, was enough for a 7.5/10 for taste from our chef.

A whole roasted chicken using the Oster TSSTTVMNDG-SHP-2 on a broiling rack and enamel baking pan on a white background.
A whole roasted chicken using the Oster TSSTTVMNDG-SHP-2 on a broiling rack and enamel baking pan on a white background.
A tray of whole toaster oven roasted chicken. The thermometer has two probes inside the chicken and displays 190°F and 192°F.
Seven pieces of carved chicken including a carcass, two breasts, two wings, and two thighs on a broiling rack and baking pan.
Two hands pulling apart a roasted chicken thigh. In the white background is the rest of the roasted chicken on a baking pan.
Cooking Time: 8
20% * 8 = 1.6
Skin: 7
20% * 7 = 1.4
Doneness: 8.8
20% * 8.8 = 1.8
Taste: 7.5
40% * 7.5 = 3.0
  • Function: Bake
  • Temperature: 350°F.
  • Cooking Time: 1h
  • Convection: Yes

Thanks to the Oster’s large capacity, we placed a 3 lb chicken on top of its broiling rack which is then set on top of the baking pan before we perform our Whole Roasted Chicken test. The overall score was 7.8/10.

The oven was able to roast the chicken in 1 hour, which was the standard amount of time needed, and deserved an 8/10. Thanks to the broiling rack and the oven’s convection system, the skin got an even golden color throughout. However, even with those advantages, the skin wasn’t able to crisp up much, so it got a 7/10. 

The chicken was fully cooked, but its internal temperature was a tad high at 190-192°F, so we gave it an 8.8/10. The meat was soft and juicy throughout, so it earned a 7.5/10 for taste from our chef.

3.6

Baked French Fries

6.0
Mueller 4 Slice Toaster Oven Baked French Fries Test
Mueller 4 Slice Toaster Oven Baked French FriesPieces of baked french fries using the Mueller MT-175 Toaster Oven on a grooved silver baking pan on a white background.
A close-up of pieces of baked french fries using the Mueller MT-175 Toaster Oven on a baking pan on a white background.
Ten pieces of broken-up baked french fries are stacked on top of pieces of whole fries on a grooved silver baking pan.
Cooking Time: 0
20% * 0 = 0.0
Color: 4.5
20% * 4.5 = 0.9
Texture: 4.5
20% * 4.5 = 0.9
Taste: 4.5
40% * 4.5 = 1.8
  • Function: Toast
  • Temperature: 400°F
  • Cooking Time: 27 m
  • Convection: No

Our Baked French Fries test brought out the Mueller’s weakness of not being able to maintain a high temperature due to its low power draw. Its even heat distribution couldn’t help much if the temperature wasn’t high enough, so the final score was 3.6/10.

We stopped the baking after 27 minutes as the fries weren’t getting any more colors. This, nonetheless, was over our time limit of 25 minutes, so it was a 0/10.

The fries had no significant color change and barely enough for a 4.5/10. We ended up with 12 oz of frozen fries that were more similar to being dried in an oven than being baked, so we gave them another 4.5/10 for texture.

Fortunately, the fries were cooked through and not soggy, so our chef could give them a 4.5/10 for taste and not a zero.

Pieces of baked french fries using the Oster TSSTTVMNDG-SHP-2 Toaster Oven on an enamel baking pan on a white background.
Pieces of baked french fries using the Oster TSSTTVMNDG-SHP-2 Toaster Oven on an enamel baking pan on a white background.
A close-up of pieces of baked french fries using the Oster TSSTTVMNDG-SHP-2 on an enamel baking pan on a white background.
Six pieces of broken-up baked french fries are stacked on top of pieces of whole fries on an enamel baking pan.
Cooking Time: 7.3
20% * 7.3 = 1.5
Color: 6.8
20% * 6.8 = 1.4
Texture: 6
20% * 6 = 1.2
Taste: 5
40% * 5 = 2.0
  • Function: Bake
  • Temperature: 400°F
  • Cooking Time: 20 m
  • Convection: Yes

The Oster left a lot to be desired in baking french fries, thus scoring a 6/10.

The oven took 20 minutes to bake 12 oz of french fries. In comparison to other toaster ovens in our Baked French Fries test, it scored a 7.3/10.

The fries had an uneven color, ranging from almost none to golden and brown on the ends, so they got a 6.8/10. The fries were very soft so they could only get a 6/10 for texture. Our chef gave the fries a 5/10 for taste.

Standard

Stainless Steel Mueller 4-Slice Toaster Oven Design Review

Oster 6-Slice Convection Toaster Oven Design: Low Wattage
5.3
design Scores
  • Exterior (20%)5.0/10
  • Interior (30%)1.0/10
  • Build Quality (50%)8.0/10
6.2
design Scores
  • Exterior (20%)7.0/10
  • Interior (30%)6.0/10
  • Build Quality (50%)6.0/10

In the Mueller MT-175 Small Toaster Oven Box

In the Oster TSSTTVMNDG-SHP-2 Convection Toaster Oven Box
A box, the Mueller MT-175 4-Slice Toaster Oven, a recipe booklet, a baking pan, an oven rack, a user manual, and a brochure.
  • Model: MT-175
  • Warranty: 1 year
  • User Manual
  • Baking Rack
  • Baking Pan

The Mueller toaster oven came in a basic packaging and positioned with two foam pads. The included accessories were simply duct-taped to the oven. Inside the box are also a user manual and a simple recipe booklet.

The Oster TSSTTVMNDG-SHP-2 has 7 cooking functions including Toast, Bake, Convection Bake, Broil, Warm, Defrost, and Pizza.
  • Model: TSSTTVMNDG-SHP-2
  • Warranty: 1-year limited (US and Canada only)
  • User Manual
  • Baking Rack
  • Baking Pan
  • Rack Clamp
  • Removable Crumb Tray
  • Rotisserie Kit and Lifter
  • Air Fryer Basket

The packaging includes two foam pads to keep the oven firmly in place and the three accessories are wrapped in carton sheets to avoid scratches during transportation. The oven also comes with a user manual.

5.0

Exterior

7.0
A closed front of the stainless steel Mueller MT-175 4-Slice Toaster Oven with exterior measurements on a white background.
A closed front of the stainless steel Mueller MT-175 4-Slice Toaster Oven with exterior measurements on a white background.
Mueller 4 Slice Toaster Oven ExteriorThe front of a closed stainless steel Mueller MT-175 4-Slice Toaster Oven has a control panel and the right has holes.
The back and left sides of the Instant Omni Plus 18L have air ventilation holes. The back has a power cord and two buffers.
The top, front, and right sides of the Black+Decker TO1760SS 4-Slice Natural Convection Toaster Oven on a white background.
On a white background, the bottom of the Mueller MT-175 Toaster Oven has a detachable crumb tray, four stands, and holes.
The detached crumb tray of the stainless steel Black+Decker TO1760SS 4-Slice Countertop Toaster Oven on a white background.
  • Weight:
    9.0 lbs (4.1 kg)
  • Length:
    15.0" (38.0 cm)
  • Width:
    11.6" (29.5 cm)
  • Height:
    8.9" (22.5 cm)
  • Material:
    Stainless steel
  • Color:
    Gray
  • Door Handle:
    Cool-touch
  • Tray Indicators:
    No
  • Crumb Tray:
    Detachable

As simple as it is, the Mueller has all the standard exterior features of a small toaster oven but also something more. The bottom of the oven acts as a detachable crumb tray which not only makes it easy to remove the falling bits and crumbs but also to clean the entire interior.

The oven has a cool-touch door handle and back buffers to prevent it from being too close to the wall. Unfortunately, it has no cord storage or carrying handles.

Our measurements of the oven’s footprint were 14.96" x 11.61" x 8.86" which pretty much coincided with the manufacturer’s 14.84" x 11.85" x 8.86". However, the weight of the oven by itself was already 9 lbs whereas the label said the entire box was 7.63 lbs.

A closed front of the Oster TSSTTVMNDG-SHP-2 Large Convection Toaster Oven with exterior measurements on a white background.
A closed front of the Oster TSSTTVMNDG-SHP-2 Large Convection Toaster Oven with exterior measurements on a white background.
The front of a closed stainless steel Oster TSSTTVMNDG-SHP-2 6-Slice Large Digital Countertop Convection Toaster Oven
The back and left sides of the Oster TSSTTVMNDG-SHP-2 Large Toaster Oven. The back has a power cord, two buffers, and holes.
On a grey background, the top of the stainless steel Oster TSSTTVMNDG-SHP-2 6-Slice Large Convection Toaster Oven has holes.
On a grey background, the bottom of the Oster TSSTTVMNDG-SHP-2 6-Slice Toaster Oven has a power cord, four stands, and holes.
  • Weight:
    12.1 lbs (5.5 kg)
  • Length:
    19.7" (50.0 cm)
  • Width:
    15.2" (38.6 cm)
  • Height:
    11.6" (29.5 cm)
  • Material:
    Stainless steel
  • Color:
    Black
  • Door Handle:
    cool-touch
  • Tray Indicators:
    No
  • Crumb Tray:
    Slide-out

The Oster has air ventilation holes on all sides of the convection system, which is a plus. In addition, having a slide-out tray is always helpful because it makes it easier to clean the oven.

Although the back buffers aren’t very sturdy, the bottom stands are and they also act as oven-carrying handles. Our measurements of the oven’s footprints were 19. 68" x 15.19" x 11.61" which were only slightly different in terms of width to the manufacturer’s provided  19.72" x 16.29" x 11.33".

Control Panel of the Small Mueller MT-175

Control Panel
The control panel of the Black+Decker TO1760SS 4-Slice Toaster Oven has 3 control knobs for temperature, function, and timer.
  • Type:
    3 control knobs
  • Temperature:
    150°F - 450°F
  • Timer:
    1 minute - 30 minutes + stay-on
  • Indicator Light:
    Yes
  • Status Bar:
    No
  • Light Toggle:
    No
  • Convection Toggle:
    No
  • Rotation Toggle:
    No
  • Automatic Preheat:
    No
  • Audio Cues:
    No

The Mueller has a basic analog control panel with three dials for temperature, function, and time. The time dial has a stay-on setting to help with its short range, similar to many other small toaster ovens. Interestingly, while the max temperature setting was 450°F, we actually recorded the internal temperature of the oven reaching 500°F on the said setting.

The Oster TSSTTVMNDG-SHP-2 Convection Toaster Oven has an LCD and 15 flat buttons for 7 cooking functions and 8 features.
  • Type:
    LCD display + 15 buttons
  • Temperature:
    150°F - 450°F
  • Timer:
    1 minute - 90 minutes
  • Indicator Light:
    Yes
  • Status Bar:
    No
  • Light Toggle:
    Yes
  • Convection Toggle:
    No
  • Rotation Toggle:
    No
  • Automatic Preheat:
    No
  • Audio Cues:
    No

The Oster has an LCD digital display and 15 buttons, including 8 functions, 2 to adjust time, 2 to adjust temperature, a light toggle, a clock feature, a stop and a start button. The built-in clock is something you rarely see in a toaster oven, but we’ve seen some comments about it, usually pointing out that the clock is ahead of time by 5 minutes.

Cooking Functions

Cooking Functions of the Oster 6-Slice Toaster Oven
The function dial of the Black+Decker TO1760SS 4-Slice Toaster Oven has 3 cooking functions including Bake, Broil, and Toast.
  • Toast
  • Bake
  • Broil
  • Keep warm

Different from most other toaster ovens, the Mueller’s Bake function only uses the lower heating elements as opposed to lower and upper. The Broil function still uses only the upper heating elements.

The Toast function is where both the lower and upper heating elements work. Nonetheless, the oven still provides all the basic functions for its intended purposes.

The Oster TSSTTVMNDG-SHP-2 has 7 cooking functions including Toast, Bake, Convection Bake, Broil, Warm, Defrost, and Pizza.
  • Toast
  • Bake
  • Convection Bake
  • Broil
  • Warm
  • Defrost (150°F)
  • Pizza (400°F)

You can only adjust the temperature on the Bake and Convection Bake functions, which should be good enough for experienced cooks. Other functions have their temperature predetermined by the manufacturer, which can be useful for beginners in the kitchen. 

For some reason, the user manual doesn’t specify the predetermined temperature for the Warm function. Nonetheless, we were able to measure it to be around 180°F, which was unfortunately quite high for its purpose. Other toaster ovens with the Warm function usually maintain around 80°F-100°F.

1.0

Interior

6.0
Mueller 4 Slice Toaster Oven InteriorThe Mueller MT-175 4-Slice Toaster Oven’s cooking chamber has 2 quartz heating elements with guards and 2 guide rails.
Mueller 4 Slice Toaster Oven InteriorThe Mueller MT-175 4-Slice Toaster Oven’s cooking chamber has 2 quartz heating elements with guards and 2 guide rails.
The Mueller MT-175 Oven has 1 bottom heating element with a guard and 2 guide rails on its right cooking chamber wall.
  • Heating Elements:
    2 quartz
  • Convection Fan:
    No
  • Lighting:
    No
  • Tray Levels:
    2
  • Rotisserie:
    No
  • Safety Hook:
    No

Similar to many other small toaster ovens, including the Comfee CFO-BB101, the Mueller lacks a convection fan and an interior light. In addition, it only has two heating elements which can usually lead to uneven heat distribution compared to four or more heating elements.

These heating elements are made of quartz which uses infrared light to cook foods faster than the more common nichrome counterparts. Quartz heating elements also cool down faster, are more energy-efficient and easier to clean but not as durable.

However, if grease splashes onto the heating elements while cooking, it’ll leave permanent stains. This is why they usually have guards which this oven also has.

The Oster TSSTTVMNDG-SHP-2 Oven’s cooking chamber has 4 nichrome heating elements, 2 guide rails, a light, and a fan cavity.
The Oster TSSTTVMNDG-SHP-2 Oven’s cooking chamber has 4 nichrome heating elements, 2 guide rails, a light, and a fan cavity.
The cooking chamber’s right wall of the Oster TSSTTVMNDG-SHP-2 Toaster Oven has 2 guide rails, a light, and a fan cavity.
  • Heating Elements:
    4 nichrome
  • Convection Fan:
    Yes
  • Lighting:
    Yes
  • Tray Levels:
    2
  • Rotisserie:
    No
  • Safety Hook:
    No

The Oster has four standard nichrome heating elements but only two tray levels—unlike the similar-sized Cosori CO130-AO that has three. In addition to a convection system, it has internal lighting which is always useful, especially when you can choose when to turn it on and off.

Capacity of the Mueller 4-Slice Toaster Oven

Capacity of the Stainless Steel Oster Digital Countertop Toaster Oven
An opened front of the stainless steel Mueller MT-175 4-Slice Toaster Oven with interior measurements on a white background.
  • Length:
    10.6" (27.0 cm)
  • Width:
    9.8" (25.0 cm)
  • Height:
    7.5" (19.0 cm)

We could fit four slices of toast, a 9-inch pizza but we could barely fit a 3 lb chicken inside the Mueller, unlike the same-sized Breville BOV450XL. We measured the cooking chamber volume to be around 12.81 liters, slightly different than the manufacturer’s provided capacity of 11.67 liters. However, it could just be a difference in measuring standards.

An opened front of the Oster TSSTTVMNDG-SHP-2 Large Convection Toaster Oven with interior measurements on a white background.
  • Length:
    14.2" (36.1 cm)
  • Width:
    12.6" (32.0 cm)
  • Height:
    9.4" (24.0 cm)

Its spacious interior can accommodate 6 slices of toast, a 12-inch pizza, and more than a 3 lb chicken. While the manufacturer didn’t state the exact capacity, we measured the cooking chamber’s volume to be around 28 liters.

Power Cord

A two-pronged plug power cord. In the background is the stainless steel Mueller MT-175 4-Slice Countertop Toaster Oven.
  • Length:
    30.7" (78.0 cm)
  • Type:
    2-prong plug
  • Power:
    1100 W
  • Rated Output:
    120 V ~ 60 Hz

The power cord is 30.7 inches long, suitable for household use. Unfortunately, the oven doesn’t have any storage space for it.

A two-pronged plug power cord. In the background is the Oster TSSTTVMNDG-SHP-2 6-Slice Large Digital Convection Toaster Oven.
  • Length:
    26.0" (66.0 cm)
  • Type:
    2-prong plug
  • Power:
    1300 W
  • Rated Output:
    120 V ~ 60 Hz

Since the power cord is positioned at the bottom of the oven, it may have some inconvenient bends. The length of roughly 25.98" is adequate for household use but not enough to wrap around the back buffers.

Baking Rack

Accessories

Baking Rack
A stainless steel baking rack of the Mueller MT-175 4-Slice Countertop Toaster Oven on a white background.
  • Length:
    10.5" (26.7 cm)
  • Width:
    8.8" (22.4 cm)
  • Height:
    0.5" (1.3 cm)
  • Material:
    Stainless steel
  • Dishwasher Safe:
    Yes

The two sides of the baking rack have slight curves upward at an angle to keep the baking pan in place. It fits perfectly with the guide to help prevent accidents when placing your food in the oven.

A stainless steel baking rack of the Oster TSSTTVMNDG-SHP-2 6-Slice Digital Convection Toaster Oven on a grey background.
  • Length:
    14.2" (36.1 cm)
  • Width:
    15.0" (38.1 cm)
  • Height:
    0.2" (0.5 cm)
  • Material:
    Stainless steel
  • Dishwasher Safe:
    Yes

The rack fits perfectly with the guide rails and helps reduce the chance of an accident when you put food in the oven.

Baking Pan

Accessories

Baking Pan
A grooved silver baking pan of the stainless steel Mueller MT-175 4-Slice Countertop Toaster Oven on a white background.
  • Length:
    10.2" (25.8 cm)
  • Width:
    7.9" (20.0 cm)
  • Height:
    0.6" (1.5 cm)
  • Material:
    Stainless steel
  • Dishwasher Safe:
    Yes

The baking pan doesn’t fit into the guide rails and has to on top of the rack. This may prevent the full use of the oven’s capacity and lead to some inconveniences during cooking.

On the bright side, the pan has ridges and grooves to give your food attractive roasting marks and catch the dripping better. It has a coating but is not completely non-stick so you may need to watch out for some stubborn stains after a hefty roast.

A enamel baking pan of the Oster TSSTTVMNDG-SHP-2 Large Capacity Digital Convection Toaster Oven on a grey background.
  • Length:
    12.9" (32.7 cm)
  • Width:
    10.5" (26.7 cm)
  • Height:
    1.2" (3.0 cm)
  • Material:
    Stainless steel with enamel coating
  • Dishwasher Safe:
    Not advisable

The baking pan goes hand-in-hand with the broiling rack to catch the drippings and meat juice. Its enamel coating makes it more resistant to stains and caramelized bits but it is not advisable to put the baking pan in the dishwasher.

However, it’s slightly smaller than the oven’s capacity and therefore, does not make the most of the space. Nonetheless, it still does the job of preventing any hot mess from dirtying the heating elements which can lead to fire danger.

8.0

Build Quality

6.0
The front of an opened stainless steel Mueller MT-175 4-Slice Countertop Toaster Oven with an oven rack and baking pan.

For a simple small toaster oven, build quality is all about how durable it is and if it works properly. The Mueller accomplishes that with a sturdy stainless steel casing and smooth-turning dials.

The front of an opened Oster TSSTTVMNDG-SHP-2 Large Convection Toaster Oven with an oven rack, baking pan, and broiling rack.

Though it is made from durable materials and has a sturdy build, the Oster isn’t heavy for its size. The digital display is clear, but the flat buttons can be irresponsive at times; this seems to be a common problem for Oster units, as the Oster TSSTTVFDDG also suffers from it.

Throughout the testing procedure, we found that the oven’s power output of 1300 W may have offset its large capacity. Our speculation was that its performance efficiency could increase with 1800 W.

Easy but Not Convenient to Use

Muller 4-Slice Toaster Oven Usability

Oster TSSTTVMNDG-SHP-2 6-Slice Toaster Oven Usability Review: Needs Better Control
5.2
usability Scores
  • User Control (30%)6.0/10
  • Ease of Use (50%)4.0/10
  • Cleanability (20%)7.0/10
6.6
usability Scores
  • User Control (30%)6.0/10
  • Ease of Use (50%)6.0/10
  • Cleanability (20%)9.0/10
6.0

User Control

6.0

Even though the Mueller only has three simple control dials, there are a few things to keep in mind. For the timer knob, when setting it to less than 10 minutes, always rotate past 10 minutes and then rotate back to the desired time.

It’s always tricky to precisely adjust time and temperature for an analog-control toaster oven and this one is no different. Nonetheless, you can use an external timer and an oven thermometer to get more accurate readings.

If you frequently use the stay-on feature, you can turn off the oven by rotating the function dial to Off instead of the timer.

For the Oster, the temperature can be adjusted in increments of 10°F. The timer can be adjusted in increments of 30 seconds when it’s below 10 minutes and in increments of 1 minute after 10 minutes. The convection fan isn’t all-applicable, but you can adjust time and temperature according to your preference on Convection Bake.

4.0

Ease of Use

6.0

What’s convenient about 100% analog toaster ovens is that it’s very simple to adjust time and temperature during cooking. When the timer runs out, a bell will sound and the oven will shut off. Afterward, you can freely leave it plugged in and not worry about power consumption as it has no digital display.

The door can open at any angle < 50° to let food cool down inside the oven. However, keep in mind that opening the door doesn’t stop the oven. The exterior shell isn’t very thick, so it gets hot to the touch quite quickly during cooking.

The Oster doesn’t beep with each press of a button which isn’t normally an issue. However, because the buttons weren’t always responsive, we had to check the display with each press and this required us to do so more than once.

One thing to keep in mind is that the oven requires you to press Cancel before changing the cooking function. After the cooking cycle finishes, the digital display will show END and the oven will sound 4 beeps 3 times. You’ll then need to press Cancel before performing further inputs.

The oven’s exterior only gets hot to the touch after a long period of cooking at a high temperature (> 400°F). The door can easily be kept partially open, but it doesn’t stop the cooking process, unlike some other ovens.

The built-in clock will keep ticking as long as the oven’s plugged in, but the power consumption should be minimal. Thus, it’s up to you to keep the oven plugged in or to remove it.

7.0

Cleanability

9.0
Mueller 4 Slice Toaster Oven CleanabilityPermanent stains on the left cooking chamber’s ceiling and the upper heating element’s guard of the Mueller MT-175 Oven.
Mueller 4 Slice Toaster Oven CleanabilityPermanent stains on the left cooking chamber’s ceiling and the upper heating element’s guard of the Mueller MT-175 Oven.
Permanent stains on the right cooking chamber’s ceiling and the upper heating element’s guard of the Mueller MT-175 Oven.
The cleaned grooved silver baking pan of the stainless steel Mueller MT-175 4-Slice Countertop Toaster Oven.

We clean the stainless steel exterior with no problem. However, after the chicken test, there were burnt bits stuck to the upper heating element’s guard and grease on the cooking chamber’s ceiling. There was ample space between the ceiling and the upper heating element, so we proceed to try every cleaning method possible.

Unfortunately, we could only scrub off the bits. Due to the interior not having a non-stick coating, there were some permanent stains on the cooking chamber’s ceiling and the upper heating element’s guard.

Luckily, the heating element itself was intact. Also, we were able to remove the stubborn stains on the baking pan by brushing them with a paste of baking soda and water.

Grease on the glass door of a closed stainless steel Oster TSSTTVMNDG-SHP-2 6-Slice Large Digital Convection Toaster Oven.
Grease on the glass door of a closed stainless steel Oster TSSTTVMNDG-SHP-2 6-Slice Large Digital Convection Toaster Oven.
Grease on the stainless steel Oster TSSTTVMNDG-SHP-2 6-Slice Large Digital Convection Toaster Oven’s cooking chamber wall.
Grease and chicken skin stuck to the enamel baking pan of the Oster TSSTTVMNDG-SHP-2 6-Slice Digital Convection Toaster Oven.
The cleaned enamel baking pan of the stainless steel Oster TSSTTVMNDG-SHP-2 6-Slice Large Digital Convection Toaster Oven.

The Oster has an internal and external coating. There are no tricky nooks and crannies. The slide-out crumb tray made cleaning up the crumbs very easy but we still had to tilt the oven to remove all of them.

Although some grease splashed inside the oven during our Whole Roasted Chicken test, we could easily clean it up using the instructions in our toaster oven cleaning guide. The baking pan, even with the enamel coating, sustained some stubborn burnt bits and stains that required brushing with a paste of baking soda and water.