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Mueller 4 Slice Toaster Oven vs Cosori Air Fryer Toaster Oven Side-by-Side Comparison

Mueller 4 Slice Toaster Oven vs Cosori Air Fryer Toaster Oven. Battle between our best-value small pick and our definitive best-to-buy pick.

By , , and Updated

Mueller 4 Slice

Cosori Air Fryer Toaster Oven

Mueller 4 Slice Toaster Oven vs Cosori Air Fryer Toaster Oven

Overall Verdict

6.1
Overall Score
8.4
Overall Score
  • Performance (50%)7.0
  • Design (25%)5.3
  • Usability (25%)5.2
  • Performance (50%)8.0
  • Design (25%)9.4
  • Usability (25%)8.3

The battle between the Mueller 4 Slice Toaster Oven (MT-175) and the Cosori Air Fryer Toaster Oven (CO130-AO) is an interesting one between our best-value small pick and our definitive best-to-buy pick. Without a doubt, the Cosori is the winner, but comparing it with the Mueller really highlights the strength of each unit.

Design-wise, the Mueller has a good overall build quality encompassing its detachable crumb tray that’s extra useful for cleaning the interior of a small toaster oven. Its control dials are also very precise for being analog.

The Cosori, on the other hand, has an intricate control panel with an informative digital display, intuitive buttons, and toggle switches for convection settings, lighting, and temperature conversion. On top of a larger capacity, these features, of course, make the Cosori cost a few times more than the Mueller.

What’s really impressive about the Mueller is its performance in spite of the common weaknesses of small units. Despite a lower power draw, the oven managed to keep up with the Cosori in toasting bread and baking pizza (though with a longer cooking time).

Nonetheless, the Cosori’s simply too good at roasting whole chicken and air-frying fries, utilizing its additional accessories including a rotisserie kit and air fryer basket.

Pros & Cons

  • Lightweight and small size
  • Easy-to-clean stainless steel exterior
  • Cool-touch door handle
  • Simple control knobs
  • Stay-on feature
  • Quartz heating elements have safeguards
  • Energy-saving
  • Great value in terms of functionality and accessories
  • Straightforward controls
  • Useful toggles
  • High-contrast digital display
  • Sturdy construction
  • Easy-to-clean stainless steel exterior
  • Cool-touch door handle
  • Spacious cooking chamber
  • No convection fan
  • No internal lighting
  • No safety mechanism for the door
  • No safety mechanism for the door
  • Convection fan isn’t all-applicable

Key Specs

Dimensions
L14.96 x W11.61 x H8.86 inches
L19.96 x W17.32 x H12.6 inches
Weight
9.0 lbs (4.1 kg)
15.7 lbs (7.1 kg)
Control Type
3 control knobs
LED display + 2 control knobs + 3 buttons
Temperature
150°F - 450°F
80°F - 450°F
Timer
1 minute - 30 minutes + stay-on
1 minute - 6 hours + 12 hours + 24 hours
Cooking Functions
4
12

Where to Buy?

Price at publication
$64.55
$189.66

*You help support HealthyKitchen101's product testing and reviews by purchasing from our retail partners.

Analysis and Test Results

Performance

Overall Performance Scoring
7.0
8.0

Toast

7.5
7.6
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.
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.
Function
Toast
Toast
Number of Slices
4
4
Toast Level
⅓ to Dark
2/7
Cooking Time
4m
5m 49s
Second Batch
4m
3m 50s
Convection
No
No

Pizza

7.6
7.6
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.
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.
Function
Toast
Bake
Temperature
450°F
450°F
Cooking Time
9m
3m 30s
Convection
No
Yes

Roasted Whole Chicken

7.0
8.9
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.
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.
Function
Toast
Rotisserie
Temperature
350°F
350°F
Cooking Time
1h 20m
40m
Convection
No
Yes

Baked French Fries

3.6
8.1
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.
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.
Function
Toast
Bake
Temperature
400°F
400°F
Cooking Time
27 m
17m
Convection
No
Yes

Design

Overall Design Scoring
5.3
9.4

In The 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.
A box, the Cosori CO130-AO, rotisserie kit and lifter, air fryer basket, baking pan, oven rack, and 6 pieces of documents.

Exterior

5.0
9.0
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.
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
9.0 lbs (4.1 kg)
15.7 lbs (7.1 kg)
Length
15.0" (38.0 cm)
20.0" (50.7 cm)
Width
11.6" (29.5 cm)
17.3" (44.0 cm)
Height
8.9" (22.5 cm)
12.6" (32.0 cm)
Material
Stainless steel
Stainless steel
Color
Gray
Silver
Door Handle
Cool-touch
Cool-touch
Tray Indicators
No
No
Crumb Tray
Detachable
Removable

Control Panel

The control panel of the Black+Decker TO1760SS 4-Slice Toaster Oven has 3 control knobs for temperature, function, and timer.
Cosori Air Fryer Toaster Oven Control Panel
Type
3 control knobs
LED display + 2 control knobs + 3 buttons
Temperature
150°F - 450°F
80°F - 450°F
Timer
1 minute - 30 minutes + stay-on
1 minute - 6 hours + 12 hours + 24 hours
Indicator Light
Yes
Yes
Status Bar
No
Yes
Light Toggle
No
Yes
Convection Toggle
No
Yes
Rotation Toggle
No
No
Automatic Preheat
No
Yes
Audio Cues
No
No

Cooking Functions

The function dial of the Black+Decker TO1760SS 4-Slice Toaster Oven has 3 cooking functions including Bake, Broil, and Toast.

Interior

1.0
9.5
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.
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
2 quartz
4 nichrome
Convection Fan
No
Yes
Lighting
No
Yes
Tray Levels
2
3
Rotisserie
No
Yes
Safety Hook
No
No

Power Cord

A two-pronged plug power cord. In the background is the stainless steel Mueller MT-175 4-Slice Countertop Toaster Oven.
A three-pronged plug power cord. In the background is the Cosori CO130-AO 30L Dehydrator Air Fryer Rotisserie Toaster Oven.
Length
30.7" (78.0 cm)
40.9" (104.0 cm)
Type
2-prong plug
3-prong plug
Power
1100 W
1800 W
Rated Output
120 V ~ 60 Hz
120 V ~ 60 Hz

Accessories

A stainless steel baking rack of the Mueller MT-175 4-Slice Countertop Toaster Oven on a white background.
A stainless steel baking rack of the Cosori CO130-AO 30L 12-In-1 Dehydrator Rotisserie Toaster Oven on a white background.
Length
10.5" (26.7 cm)
14.2" (36.0 cm)
Width
8.8" (22.4 cm)
13.4" (34.0 cm)
Height
0.5" (1.3 cm)
0.3" (0.7 cm)
Material
Stainless steel
Stainless steel
Dishwasher Safe
Yes
Yes

Build Quality

8.0
9.5
The front of an opened stainless steel Mueller MT-175 4-Slice Countertop Toaster Oven with an oven rack and baking pan.
The front of an opened Cosori CO130-AO Toaster Oven with a removable crumb tray, oven rack, baking pan, and air fryer basket.

Capacity

An opened front of the stainless steel Mueller MT-175 4-Slice Toaster Oven with interior measurements on a white background.
An opened front of the Cosori CO130-AO 30L 12-In-1 Rotisserie Toaster Oven with interior measurements on a white background.
Length
10.6" (27.0 cm)
14.2" (36.0 cm)
Width
9.8" (25.0 cm)
13.8" (35.0 cm)
Height
7.5" (19.0 cm)
9.8" (25.0 cm)

Usability

Overall Usability Scoring
5.2
8.3

User Control

6.0
9.5

Easeof Use

4.0
8.0

Cleanability

7.0
7.5
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.
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.

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Behind the Comparison

Headshot of Alan Nguyen
Alan NguyenReviewer

Alan Nguyen is a writer and product reviewer at HealthyKitchen101. His major in English language teaching taught him to present concise information. In addition to his cooking hobby, he values the practical aspects of household appliances.

Headshot of Lap Vo
Lap VoTest Lead

Lap is Head of the Research, Testing, and Review Team (RTR Team) at HealthyKitchen101.com, where he directs and supervises the testing of kitchen gadgets and appliances.

Headshot of Tuyet Pham
Tuyet PhamProfessional Chef

Tuyet Pham is an award-winning Saigonese chef passionate about delicious and healthful foods. At HealthyKitchen101, she develops recipes and collaborates with our Research, Testing, and Review lab to evaluate the performance of cooking appliances. Her assessments add a strong authoritative voice to our product scoring process.

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