This easy flourless chocolate mug cakes cooks in the microwave and is only 3 ingredients. It’s also gluten-free, low carb and keto-friendly.
close-up photo of a keto chocolate mug cake topped with fresh raspberries

After creating a keto low carb peanut butter mug cake, I have been working on trying to create a chocolate one. This cake is just as quick and easy.
overhead photo of a chocolate mug cake

Size of the Mug Cake

The cake is quite rich so it is not that big. It’s about the size of a typical flourless chocolate cake or an unfrosted cupcake.

TYPE OF MUG TO USE

This cake can be made in an 8 oz microwave-safe mug. The cake will rise while cooking before sinking back down.

I recommend using a wide mug. It’s difficult to evenly cook the cake when using a tall and narrow mug.

You can also cook it in a bigger mug and then plate it in a smaller mug.

Toppings for the Cake

I do find the cake a little plain on its own, so I would recommend adding some sort of topping. Some toppings I’ve used:

  • Fresh fruit
  • Sugar-free chocolate syrup
  • Powdered sugar substitute (like swerve)

overhead photo of a chocolate mug cake with fresh raspberries

If you want another keto mug cake be sure to check out my Keto Nutella Mug Cake, too.

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4.50 from 8 votes

3 Ingredient Keto Chocolate Mug Cake

An easy cake that cooks in the microwave. This chocolate mug cake is just 3 ingredients and is low carb, gluten free and keto friendly. 
Servings: 1
Prep Time: 5 minutes
Cook Time: 1 minute
Total Time: 6 minutes
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Ingredients

  • 1 large egg
  • 1 tbsp + 1/2 tsp Natural Mate All Purpose Granular Stevia, or sugar substitute of your choice equivalent to 2 tbsp + 1 tsp sugar
  • 1 3/4 tbsp unsweetened dutch process cocoa powder

Instructions
 

  • In a microwave-safe mug that holds at least 8 oz of liquid, add all ingredients.
  • Whisk with a small whisk until batter is completely smooth and egg has been fully beaten and incorporated into batter. 
  • Cook in the microwave at full power for about 45 seconds. I use a 1000 watt microwave. If your microwave power is less or more, please adjust cooking time and/or cooking power accordingly. Let the cake cool a few minutes before eating. Cake is best eaten warm with toppings. 

Notes

  • For the sugar substitute, I used Natural Mate Stevia All Purpose Natural Sweetener*
  • If you have a favorite keto friendly sugar substitute, it will likely work with this recipe. Just make sure you add the equivalent of 2 tbsp + 1 tsp of sugar.
  • I use a 1000 watt microwave. If your microwave power is less or more, please adjust cooking time and/or cooking power accordingly.
  • The cake is best enjoyed warm as it does tend to get a little dry if left to sit for several hours.
  • I do find the cake a little plain on its own, so I would recommend adding toppings. Some toppings I've used include fresh berries, sugar free chocolate syrup and powdered sugar substitute (like swerve)
  • *Some of the product links contained in this post are affiliate links. Much like referral codes, this means I earn a small commission if you purchase a product I referred (at no extra charge to you).
Estimated Nutrition Information does not include toppings or carbs from erythritol
Calories: 102kcal, Carbohydrates: 5g, Protein: 8g, Fat: 6g, Saturated Fat: 2g, Sodium: 82mg, Fiber: 3g, NET CARBS: 2
The nutrition information provided are only estimates based on an online nutritional calculator. This is not a comprehensive list of all the nutrients in the recipe (i.e., does not include vitamins, cholesterol, etc). I am not a certified nutritionist. Please consult a nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.
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