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5-ingredient Peanut butter Brownie Mug Cake

  • Author: Alice Pagès
  • Prep Time: 2 minutes
  • Cook Time: 1 minute
  • Total Time: 3 minutes
  • Yield: 1 mug 1x
  • Category: Cake
  • Method: Microwave


This vegan flourless peanut butter brownie mug cake is super moist, needs only 5 simple ingredients and is ready under 3 minutes! Made with no flour, no sugar and no oil, it’s THE ultimate healthy snack or dessert.


  • 1 banana, not over ripe
  • 2 tbsp peanut butter
  • 2 tbsp cocoa powder
  • 1/4 tsp baking powder
  • 1 tbsp dark chocolate chips
  • More peanut butter for filling


  1. Peel and mash the banana using a fork until roughly puréed.
  2. Add the banana purée, peanut butter, cocoa powder, baking powder and chocolate chips directly in a large microwave-safe mug and whisk until combined. The batter should look like a brownie cake batter. Add a spoon of peanut butter on top and stir to roughly mix with the brownie batter.
  3. Microwave on high for 45-60 seconds. Then open the door and check the batter by gently pushing with your finger: the cake should be gooey in the center, but dry on the surface. If the batter is still too wet, microwave another 15 seconds and check again. Cook in 15-second intervals until it’s baked.
  4. Top with more chocolate chips if desired and enjoy right away.


  1. This recipe leads to a medium-large mug serving. For a smaller mug cake, feel free to divide the quantities and so to reduce the baking time.
  2. Make sure to use a microwave-proof mug. The mug should be big enough to be three-quarters full with the raw dough as it will rise during the baking.
  3. For this recipe, I recommend to use yellow and still a little firm banana, not over ripe. Using very ripe banana can make the mug cake too mushy. 
  4. You can also bake your mug cake in a traditional oven, for 10-12 minutes at 350F, or until a toothpick comes out just clean. 

Keywords: mug, mug cake, brownie, chocolate cake, peanut butter, gluten free, snack, cake