Healthy Air Fryer Chocolate Cake (No Flour, No Eggs, No Added Sugar)

This healthy air fryer chocolate cake is a whole 6-inch cake made from rolled oats, cocoa and Greek yogurt. There’s no all-purpose flour, no eggs and no added sugar, and your oven stays off. It’s a real cake you slice for the whole family, not another single-serve mug cake.

I’m Neetu, and I’ve spent more than 9 years baking cakes without eggs or refined flour. The two tricks that keep this oat cake moist instead of dry are below: a pinch of instant coffee and a foil tent halfway through.

Quick recipe overview

Prep time	15 minutes
Cook time	28–32 minutes
Cooling time	1 hour
Total time	About 1 hour 45 minutes
Servings	8 slices
Yield	One 6-inch round cake
Calories	About 185 per slice
Protein	About 9 g per slice
Diet	Vegetarian · no eggs · no added sugar · gluten-free with certified GF oats

Why you’ll love this recipe

• A whole cake, not a mug cake. Eight real slices from one 6-inch pan.
• No flour. Rolled oats blended in under a minute become your flour.
• No eggs. Greek yogurt holds the cake together and keeps it moist.
• No added sugar. Sweetened with monk fruit, frosting included.
• No oven. It all happens in your air fryer, which is handy on hot days or when the oven is busy.
• Pantry ingredients. Oats, cocoa, yogurt, milk and oil. Nothing hard to find at a US grocery store.

Ingredients

For the cake

• Rolled oats, 1½ cups (135 g). Blended into flour, these are the base of the cake. Old-fashioned rolled oats work best. Quick oats work too. Skip steel-cut oats, which won’t blend fine enough. For a gluten-free cake, buy oats labeled certified gluten-free (Bob’s Red Mill sells them). Store-bought oat flour works by weight: use 135 g.
• Unsweetened cocoa powder, ⅓ cup (30 g). Regular natural cocoa (like Hershey’s) is what this recipe uses. Dutch-process cocoa gives a darker, smoother cake, but it reacts less with baking soda, so the rise may be slightly lower. Avoid hot cocoa mix, which has sugar.
• Baking powder 1½ tsp, baking soda ½ tsp, pinch of salt. You need both leaveners, because oat flour has no gluten to trap air. Check that your baking powder is less than 6 months old.
• Plain Greek yogurt, 1 cup (240 g). This replaces the eggs and gives the cake its moist crumb. Use thick, plain, unsweetened Greek yogurt (2% or whole milk). Nonfat works but makes a slightly drier cake. Vanilla yogurt adds sugar, so skip it.
• Milk, ½ cup (120 ml). Any dairy milk works. Unsweetened almond or oat milk also works.
• Neutral oil, ¼ cup (60 ml). Canola, avocado or light olive oil. Melted coconut oil works but firms up in the fridge.
• Monk fruit sweetener, ½ cup (about 90 g). Use a granulated monk fruit and erythritol blend that measures 1:1 like sugar (Lakanto Classic is a common US brand). Pure monk fruit extract is far sweeter and can’t be swapped cup for cup.
• Vanilla extract, 1 tsp.
• Optional: instant coffee or espresso powder, ½ tsp. It makes the chocolate taste deeper. You won’t taste coffee.
• Optional: sugar-free chocolate chips (such as Lily’s), for the top.

For the frosting

• Plain Greek yogurt, ¾ cup (180 g). Use the thickest you can find so the frosting holds its shape.
• Unsweetened cocoa powder, 2 tbsp.
• Monk fruit sweetener, 2–3 tbsp. Use a powdered monk fruit blend if you can find one. Granulated can stay slightly gritty in a no-cook frosting.

Equipment

• Air fryer that fits a 6-inch pan with about an inch of space around it (a 5.5-quart basket or larger usually works)
• 6-inch round cake pan
• Parchment paper
• Blender or food processor
• Two mixing bowls, a whisk and a spatula
• Aluminum foil
• Toothpick or cake tester
• Wire cooling rack
• Offset spatula (optional, for frosting)

How to make healthy air fryer chocolate cake

1. Prep the pan. Line the bottom of a 6-inch round pan with a parchment circle and lightly grease the sides. If your air fryer needs it, preheat it to 320°F (160°C) for 3–5 minutes.
2. Make the oat flour. Blend 1½ cups (135 g) rolled oats for 30–60 seconds, until fine and powdery like flour. Rub a pinch between your fingers. There should be no big flakes left.
3. Mix the dry ingredients. In a bowl, whisk the oat flour, cocoa, baking powder, baking soda and salt. Whisk well, or sift the cocoa, until there are no dark lumps.
4. Mix the wet ingredients. In a second bowl, whisk the Greek yogurt, milk, oil, monk fruit and vanilla until smooth and glossy, about 30 seconds. Add the instant coffee now if you’re using it.
5. Combine. Add the dry mix to the wet mix. Fold with a spatula just until no dry streaks remain. The batter will be thick, like a soft brownie batter. Don’t overmix.
6. Fill the pan. Scrape the batter into the pan and smooth the top. Tap the pan on the counter 2–3 times to release air bubbles. Scatter chocolate chips on top if using.
7. Air fry. Place the pan in the basket. Air fry at 320°F (160°C) for 28–32 minutes.
8. Tent with foil at 15 minutes. Open the basket, lay a loose sheet of foil over the pan and tuck the edges under the pan so the fan can’t blow it off. This stops the top from burning before the middle bakes.
9. Check for doneness. At 28 minutes, insert a toothpick in the center. It should come out clean or with a few moist crumbs. Wet batter means it needs 2–4 more minutes. The top should spring back when pressed lightly.
10. Cool completely. Cool in the pan for 10 minutes, then turn out onto a rack and cool fully, about 1 hour. A warm oat cake is fragile and will crumble. A cool one slices cleanly.
11. Make the frosting. Whisk ¾ cup (180 g) Greek yogurt, 2 tbsp cocoa and 2–3 tbsp monk fruit until smooth and thick. Taste and adjust the sweetness.
12. Frost and slice. Spread the frosting over the cooled cake. Chill for 20–30 minutes for the cleanest slices, then cut into 8 pieces.

Tips for the best healthy chocolate cake

• Blend the oats fine. Coarse oat flour gives a grainy, crumbly cake.
• Use room-temperature yogurt and milk. Cold dairy makes the batter stiff and the cake can bake unevenly.
• Don’t skip the foil. Air fryers blow hot air straight down on the top. The foil is what lets the center catch up.
• Weigh your oats if you can. 135 g is more reliable than cups, because scooped oats vary a lot.
• Taste the frosting before spreading. Yogurt brands vary in tang, so adjust the monk fruit.
• Cool before you frost. Yogurt frosting melts and slides off a warm cake.

Common mistakes (and how to fix them)

Problem	Why it happens	How to fix or prevent it
Top burnt, middle raw	Direct fan heat on the top	Tent with foil at 15 minutes. If your air fryer runs hot, drop to 300°F and add a few minutes
Cake crumbles when sliced	Sliced while warm	Cool fully. Chill the frosted cake 20–30 minutes before cutting
Dense, gummy center	Underbaked, or batter overmixed	Bake until the toothpick comes out clean. Fold only until no dry flour shows
Dry, crumbly cake	Too much oat flour (scooped cups), or overbaked	Weigh 135 g oats. Start checking at 28 minutes
Frosting is runny	Thin yogurt or a warm cake	Use thick Greek yogurt, frost a cold cake, chill after frosting
Gritty frosting	Granulated monk fruit doesn’t dissolve	Use a powdered blend, or blitz granulated in the blender first
Foil blows into the fan	Loose foil lifted by airflow	Tuck the foil edges under the pan

Substitutions

Original	Substitute	Effect	Recommended?
Rolled oats, 135 g	Store-bought oat flour, 135 g	Same result, saves the blending step	Yes
Greek yogurt (cake)	Thick dairy-free yogurt (coconut or almond)	Slightly less structure and protein	Yes, untested
Milk	Unsweetened almond, oat or soy milk	Barely noticeable	Yes
Neutral oil	Melted butter, 60 ml	Richer taste, firmer when chilled	Yes
Monk fruit blend	Allulose, 1:1	Softer, browns faster: watch the foil timing	Yes
Monk fruit blend	Maple syrup or honey, ⅓ cup	Adds sugar. Remove 2 tbsp milk. No longer “no added sugar”	Only if sugar is fine for you
Natural cocoa	Dutch-process cocoa	Darker, smoother, slightly less rise	Yes
Greek yogurt (frosting)	Thick dairy-free yogurt	Softer frosting	Yes, chill well

I don’t recommend almond flour or coconut flour for the oats here. They absorb liquid very differently, so the batter would need to be reworked.

Variations

• Mocha: increase the instant coffee to 1 tsp and add a pinch to the frosting.
• Chocolate peanut butter: swirl 2 tbsp natural peanut butter on top of the batter before air frying. This adds a little protein.
• Berry: top the frosted cake with fresh raspberries or strawberries.
• Chocolate chip: fold ¼ cup sugar-free chocolate chips into the batter.
• Holiday: add ¼ tsp peppermint extract to the frosting and top with crushed sugar-free candy canes.

How to store healthy air fryer chocolate cake

• Refrigerator: the yogurt frosting means the cake must be refrigerated. Store it covered or in an airtight container for up to 3 days.
• Freezer: freeze the cake unfrosted, wrapped tightly in plastic wrap and foil, for up to 2 months. Yogurt frosting doesn’t freeze well.
• Thawing: thaw overnight in the fridge, then frost.
• Texture changes: the cake gets denser and more fudgy after a night in the fridge. Let a slice sit out 10 minutes before eating.

Make ahead

Bake the cake up to 1 day ahead and keep it unfrosted and covered in the fridge. Frost it the day you serve it. For weekly meal prep, slice and freeze unfrosted pieces, then frost a slice at a time.

Serving suggestions

• With fresh berries and an extra spoon of Greek yogurt
• With a cup of coffee or a glass of cold milk
• Topped with a few sugar-free chocolate chips or shaved dark chocolate
• As a birthday cake for a small group: a 6-inch cake serves 8 thin or 6 generous slices

Nutrition information

Per slice (1 of 8), including frosting:

Nutrient	Amount
Calories	185
Protein	9 g
Carbohydrates	17 g (plus about 15 g erythritol, not counted)
Fiber	3.5 g
Total sugar	3 g
Added sugar	0 g
Total fat	10 g
Saturated fat	2 g
Sodium	215 mg

Assumptions: 2% plain Greek yogurt, 2% milk, canola oil, natural cocoa, a monk fruit + erythritol blend (zero calories), double-acting baking powder. Optional coffee and chocolate chips not included.

Nutrition information is an estimate and may vary depending on the brands and ingredients used.

What’s in a slice

• Protein: most of the 9 g comes from the Greek yogurt in the cake and the frosting, plus some from the oats.
• Fiber: the oats and cocoa together give about 3.5 g per slice.
• Sugar: the 3 g of sugar comes naturally from the yogurt and milk. None is added.
• Calories: about 185 per slice, most of it from the oil, oats and yogurt.

Frequently asked questions

Can you bake a whole cake in an air fryer? Yes. A 6-inch round pan fits most 5.5-quart and larger air fryers. Bake at a lower temperature than you would in the oven, and cover the top with foil partway through so it doesn’t burn.

Is this chocolate cake really flourless? It has no all-purpose, wheat or almond flour. The only “flour” is rolled oats you blend yourself.

Is this cake gluten-free? Oats are naturally gluten-free but often processed alongside wheat. Use oats labeled certified gluten-free if you need the cake to be gluten-free.

Can I make this without an air fryer? Yes. Bake in a 6-inch pan in a 350°F (175°C) oven. Start checking at 30 minutes.

How much protein is in a slice? About 9 g, mostly from the Greek yogurt.

Can I make it less sweet? Yes. Cut the monk fruit in the cake to ⅓ cup. The frosting can go down to 2 tbsp.

Why did my cake sink in the middle? It was probably underbaked, or the basket was opened too often early on. Only open it once at 15 minutes for the foil, then at 28 minutes to test.

Can I use regular yogurt instead of Greek yogurt? Regular yogurt is thinner and will make the batter runny and the frosting won’t hold. Strain it in a coffee filter for 2–3 hours first to thicken it.

Can I freeze this cake? Yes, unfrosted, for up to 2 months. Thaw it in the fridge and frost before serving.

Can I make it without eggs and dairy? It’s already egg-free. For dairy-free, use thick dairy-free yogurt and plant milk. This version is untested, so expect a slightly softer cake.

Final thoughts

If you’ve been making chocolate mug cakes because a whole cake felt like too much sugar and too much work, try this one. It’s oats, cocoa and yogurt, mixed in two bowls and baked in the air fryer, and it gives you eight slices to share.

Watch me make it step by step in the video above, and if you liked it, try my Healthy Air Fryer Apple Cake next.