Kirbie's Cravings

3 Ingredient Keto Chocolate Mug Cake

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.


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.

3 Ingredient Keto Chocolate Mug Cake

Servings: 1
Prep Time: 5 minutes
Cook Time: 1 minute
Total Time: 6 minutes
Course: Dessert
Cuisine: American
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. 
5 from 6 votes


  • 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


  • 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. 


  • 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. I am not a certified nutritionist. Please consult a professional nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.

Did you make this recipe?I'd love to see it! Mention @KirbieCravings and tag #kirbiecravings!

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Recipe Rating

16 comments on “3 Ingredient Keto Chocolate Mug Cake”

  1. Had a sweet craving but didn’t want to hurt my keto status. Found this and oh my soon good. I added a small pinch of chili, cooked it 50 sec 1000 watt microwave. Came out awesome, like a molten chocolate cake. Topped it with a dollop of yogurt. Yummy. Thank you for sharing.

  2. was having a wicked chocolate attack——like a maniac looking for a mug chocolate cake—–found yours and it had to be easy———you saved my keto diet thank you 5 star recipe

  3.  It hit that “sweet spot”! I did add a dash of peppermint flavoring …… oh my it was sooo goood!!!

  4. Quick, low cal chocolate craving crusher.

  5. I’ve made this several times, definitely a keeper! Not as good as a sugary chocolate cake, of course, but for keto or Atkins it’s great. I add a little whipped cream and sometimes walnuts depending on where I’m at in my diet/weight. I cook for a little over a minute in my 1000 watt microwave.

  6. Thank you for sharing this!!!
    Being Keto is challenging but you are making it easier 🙂

  7. Oh my!  This is exquisite!  So easy, so Keto! I’m a fan!

  8. Tried it! Yummy !!