90-Second High Protein Chocolate Cake (Fudgy Microwave Cake)

This 90-second High Protein Chocolate Cake is a soft, fudgy, single-serve dessert made in the microwave with simple ingredients. It’s higher in protein from yogurt and egg, with a rich chocolate flavor and thick frosting. Perfect when you want something fast that actually tastes like real cake.

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a slice of chocolately high protein cake, with a fudgy center and a glossy frosted coating

Most high-protein mug cakes miss the mark. They’re either dry, rubbery, or just taste like protein powder with cocoa. Yuck.

I think for me, the goal here was simple: make something that actually eats like cake. Soft center, rich chocolate flavor, and a texture that holds up even after cooling. This one lands right between a fudgy cake and a light brownie, especially if you let it rest.

two slices of high protein chocolate cake, with a fudgy chocolate frosting layer inside

If you’ve tried my High-Protein Microwave Chocolate Lava Cake or it's Pistachio cousin, this is the more structured version you can frost and slice. And if you want something even richer, my Fudgy High-Protein Chocolate Cheesecake takes that same idea further into a denser, dessert-style finish.

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Why this recipe works
Recipe
Commonly Asked Questions about the High Protein Chocolate Cake
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Why this recipe works

Balanced structure from egg + yogurt
The egg gives the cake lift and structure, while the Greek yogurt adds moisture and protein. That combination keeps it soft instead of rubbery.

Low flour, high cocoa ratio
Using just a small amount of flour keeps the crumb light, while the cocoa drives the flavor. That’s what gives it that deep chocolate profile without needing melted chocolate.

Short cook time = fudgy texture
The big thing here is not overcooking. Around 90 seconds keeps the center slightly soft, which makes it feel more like a real dessert than a quick mug cake.

Thick yogurt frosting that actually works
Instead of a sugar-heavy frosting, this uses thick yogurt, cocoa, and sweetener. It sets up slightly in the fridge and gives you that creamy, rich finish without overpowering the cake.

"It's literally ready in 90 seconds. And the macros are so good, I could eat this for breakfast. How! Yummmm. "

Susie (email subscriber)

Recipe

a personal sized high protein chocolate cake on a plate with raspberries

Chef Josh

90-Second High Protein Frosted Fudgy Chocolate Cake

A soft, fudgy high protein chocolate cake made in 90 seconds with a thick, creamy chocolate yogurt frosting.

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Prep Time 5

Cook Time 2

Total Time 7

Servings: 1 cake

Ingredients Method Nutrition Video Notes

Video

Ingredients

Cake

1 large egg
2 tablespoon Greek yogurt
1 tablespoon honey (maple syrup, or sweetener of choice)
1 tablespoon oat flour (almond flour, or all-purpose flour)
1 tablespoon unsweetened cocoa powder
1 teaspoon baking powder
½ teaspoon vanilla extract
Pinch of salt

Frosting

⅔ cup Greek Yogurt
1 scoop Protein Powder (of your choice)
3 tablespoon unsweetened cocoa powder

Optional Frosting Add On

2 tablespoon honey, maple syrup, or sweetener of choice (if you prefer sweeter frosting)

Method

Prepare the batter: Lightly grease a microwave-safe bowl or mug, then whisk together the egg, Greek yogurt, and sweetener until smooth.
Add dry ingredients: Add the flour, cocoa powder, baking powder, vanilla extract, and salt, then whisk until fully smooth and lump-free.

Note! After whisking everything together, make sure the batter only fills half of the container as it will double in size in the microwave. If you have extra batter, use another container. 🙂

Cook the cake: Microwave on high for 90 seconds until the center is set but slightly soft, or bake at 350°F for 15–20 minutes.
Rest the cake: Let the cake sit for 2–3 minutes, then remove from the bowl and allow it to cool slightly.
Make the frosting: Mix the Greek yogurt, protein powder, cocoa powder, and sweetener (if using) until thick and smooth.
Assemble the cake: Slice the cake in half, spread frosting between the layers, stack, and frost the outside evenly.
ENOY!

Notes

After whisking everything together, make sure the cake batter only fills half of the container as it will double in size in the microwave.
The big thing here is timing. Go past 90 seconds and you lose that soft center, and once it dries out, there’s no fixing it.
Use the thickest yogurt you can find. If I’m being honest, that’s what makes the frosting actually feel like frosting instead of just flavored yogurt.
If you want to take it further, a drizzle of my Easy 2-Ingredient Caramel Sauce on top adds a completely different layer without much extra work.
Also, letting the cake chill for an hour changes everything. The texture tightens up and becomes more fudgy, closer to something like my High-Protein Microwave Chocolate Lava Cake, just more structured.

Nutrition

Serving: 1cakeCalories: 430kcalCarbohydrates: 44gProtein: 52gFat: 10gSaturated Fat: 4gPolyunsaturated Fat: 1gMonounsaturated Fat: 3gTrans Fat: 0.03gCholesterol: 222mgSodium: 597mgPotassium: 728mgFiber: 8gSugar: 25gVitamin A: 324IUVitamin C: 0.1mgCalcium: 570mgIron: 6mg

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Commonly Asked Questions about the High Protein Chocolate Cake

Can I make this without a microwave?

Yes. Bake it at 350°F for 15–20 minutes. The texture will be slightly less fudgy than the microwave version.

Why is my cake rubbery?

It’s almost always overcooked. =( Start checking at 75–80 seconds if your microwave runs hot.

Can I use protein powder?

You can replace the flour with a small amount of protein powder, but it will make the cake slightly denser. Add a splash of milk if the batter gets too thick.

What’s the best sweetener to use?

Honey and maple syrup give the best texture. Sugar-free sweeteners work, but can slightly dry out the cake.

Can I make this ahead of time?

Yes. It actually gets more fudgy after chilling for 1–2 hours in the fridge.