Chocolate Peanut Butter Mug Cake

Chocolate Peanut Butter Mug Cake

Prep Time: 5 minutes

Cook Time: 1 minute

Yield: 1 mug cake

This Chocolate Peanut Butter Mug Cake is moist, rich and indulgent. A chocolate cake made with dark chocolate with a generous dollop of smooth peanut butter.


  • 2 tbsp unsalted butter
  • 40g (1.4 oz) dark chocolate, finely chopped
  • 1 medium egg
  • 2 tbsp milk
  • 3 tbsp granulated sugar
  • pinch of salt
  • 3 tbsp self-raising flour, see notes
  • 2 tbsp peanut butter
  • (optional) 1 tbsp salted peanuts, coarsely chopped


  1. Add the butter and chocolate to a large microwave-safe mug and microwave in short 20-second bursts until melted.
  2. Add the egg and milk and beat with a fork until smooth.
  3. Add the sugar, salt and flour and beat again to smooth, microwave for 30 seconds then gently add the peanut butter to the top of the batter - do not stir.
  4. Microwave again for around 1 minute to 1 minute 10 seconds, or until cooked.
  5. (optional) top with more peanut butter or with peanut butter and peanut sprinkled on top.


If you don't have any self-raising flour, substitute for plain (all-purpose) flour and add an additional ¼ tsp baking powder.

Feel free to play around with the recipe. Here are some examples of adaptations:

  • If you want a more chocolate-y flavour, remove 1 tbsp of flour and add 1 tbsp of unsweetened cocoa powder.
  • Again, to add more depth of flavour, add a pinch of instant espresso powder. If doesn't add a coffee flavour, just gives the chocolate flavour an incredible depth.
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