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peanut butter microwave cake
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5 from 1 vote

Keto Peanut Butter Mug Cake

Prep Time5 mins
Cook Time1 min
Total Time6 mins
Servings: 1 peanut butter mug cake
Calories: 390kcal



  • In a bowl (or the greased ramekin/mug you want to use) mix together the peanut butter, butter, egg yolk and vanilla extract until well-combined.
  • Add the two sweeteners and mix well once again.
  • Add the almond flour, coconut flour, baking powder, xanthan gum and salt and mix again until you get a nice thick dough. (You can add 1-2 tsp heavy cream at this point for a gooier cake).
  • Press this dough evenly into the bottom of the ramekin or whichever greased mug you plan to use.
  • Microwave the cake for ~45s then top with additional chopped peanuts and peanut butter if desired and enjoy!


**Note - These are updated directions compared to my youtube video. I found this way easier, you don't have to use an extra bowl and it helps to fully dissolve the sweeteners!**

Tips For Making This Keto Peanut Butter Mug Cake

  • This cake reminds me of a chewy peanut butter cookie but if you'd like it more cake like, add a bit of heavy cream to the batter!
  • Don't like peanut butter? Try this cake with almond butter or hazelnut butter instead!
  • All microwaves vary, if yours is quite high heat like mine, you may only need 45s where-as if you microwave tends to heat more slowly, you may need a full minute. You can also bake it less if you want a softer, more gooey cake! 

Ingredients In Keto Peanut Butter Mug Cake

  • Natural Peanut Butter
  • Butter
  • Egg Yolk
  • Sukrin Brown Sweetener
  • Powdered Monkfruit/Erythritol Sweetener
  • Vanilla Extract
  • Almond Flour
  • Coconut Flour
  • Xanthan Gum


Serving: 1mug cake | Calories: 390kcal | Carbohydrates: 5.1g | Protein: 8.9g | Fat: 33.8g | Fiber: 3.8g