Peanut Butter Mug Cake

Tender, fluffy peanut butter mug cake takes care of your cravings for sweets in a flash. It is so quick that you can be enjoying this sweet treat in less than 5 minutes! This recipe serves 1 but the cake is large enough (and filling enough!) to share with someone you love. Just 6.8 net carbs for the whole dessert, 3.4 net carbs if you split it. Cook time is 20 to 30 seconds.
Cuisine low carb
Prep Time 3 minutes
Cook Time 1 minute
Total Time 4 minutes
Servings 1 large mug cake
Author Marye


  • 1/3 cup almond flour
  • 1 tablespoon sugar free sweetener
  • 1/2 teaspoon monkfruit powder or equivalent Stevia
  • 1/2 teaspoon baking powder
  • 1/4 teaspoon baking soda
  • 1/8 teaspoon cream of tartar
  • Pinch of kosher salt
  • 1 egg
  • 2 tablespoons butter
  • 1 tablespoon peanut butter
  • 2 tablespoons club soda
  • 1/4 teaspoon vanilla extract
  • Butter for greasing mug


  • Grease the mug with a light coating of butter.
  • Melt the butter on the stove, watching carefully until it turns a golden brown. If it gets too dark it will be bitter.
  • Let cool to room temperature.
  • Mix the almond flour, sweeteners, baking powder, baking soda, cream of tartar, and salt in a bowl.
  • Blend in the egg, butter, peanut butter, club soda, and vanilla.
  • Spoon into the mug.
  • Microwave on high for 20 to 30 seconds, or until it is just firm on top. Don't overcook or it will be dry.
  • Remove from the microwave (some shrinkage is normal) and top with your favorite topping.


1 Serving: Calories - 550... Fat - 55.3 ...Carbs - 11.8 ... Net Carbs - 6.8...Sugars - 3.3 ... Protein - 16.5.