a peanut butter mug cake topped with whipped cream, peanut butter pieces and chocolate shavings and a spoon

Keto Peanut Butter Mug Cake

Sometimes only a moist, fluffy Keto peanut butter mug cake will do! This sugar free, low carb microwave dessert recipe takes less than 5 minutes from start to finish. Dairy-free option!

Course Dessert
Cuisine British
Keyword keto mug cake, keto peanut butter mug cake
Prep Time 3 minutes
Cook Time 1 minute
Total Time 4 minutes
Servings 2
Calories 280 kcal
Author Katrin


  • 1 1/2 tbsp coconut flour
  • 2 tbsp peanut butter
  • 1 1/2 tbsp powdered sweetener add an additional 1/2 tsp if you have a sweet tooth
  • 3 tbsp double / heavy cream or coconut cream for dairy free
  • 1 egg medium
  • 1/4 tsp baking powder
  • 1 tbsp dark chocolate, chopped or sugar free chocolate chips optional


  1. Mix all ingredients in a tall glass or cup, using a fork. Fold in the chocolate last, if using.

  2. Microwave on high for about 90 seconds.

Recipe Notes

For best results, make sure your peanut butter is soft. Almond butter also works. 

See the tips in the post about the choice of vessel. It's also possible to use 2 ramekins. 

Optional tweaks: 1/2 tsp vanilla extract, 1 tsp cinnamon

Decorate with whipped cream or coconut cream and chocolate chips (decoration is not included in the nutrition details).

The cake is best enjoyed warm. 

Nutrition (3.6 net carbs p.p.) is calculated on the basis of 2 people sharing - this cake is VERY filling. 

Nutrition Facts
Keto Peanut Butter Mug Cake
Amount Per Serving
Calories 280 Calories from Fat 206
% Daily Value*
Fat 22.9g35%
Saturated Fat 9g56%
Polyunsaturated Fat 5g
Monounsaturated Fat 6.1g
Carbohydrates 7.2g2%
Fiber 3.6g15%
Sugar 3.4g4%
Protein 10.3g21%
* Percent Daily Values are based on a 2000 calorie diet.