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Keto Peanut Butter Mug Cake – Quick, Cozy, and Low-Carb

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Prep Time 15 minutes
Cook Time 30 minutes
Total Time 45 minutes
Servings: 4 servings
Ingredients Method

Ingredients
  

  • 1 large egg – Helps the cake rise and hold together.
  • 2 tablespoons creamy, no-sugar-added peanut butter – Look for natural peanut butter with just peanuts and salt.
  • 1 tablespoon almond flour – Adds structure without the carbs.
  • 1 tablespoon coconut flour – Soaks up moisture and creates a cake-like crumb.
  • 1 to 2 tablespoons granulated erythritol or allulose – Adjust for sweetness. Allulose browns more.
  • 1/2 teaspoon baking powder – For lift.
  • 1 tablespoon heavy cream – Moisture and richness (use unsweetened almond milk for dairy-free).
  • 1/2 teaspoon vanilla extract – Rounds out the flavor.
  • Pinch of salt – Balances sweetness and boosts peanut flavor.
  • Optional add-ins – A few sugar-free chocolate chips, a pinch of cinnamon, or a swirl of peanut butter on top.

Method
 

  1. Choose the right mug. Use a microwave-safe mug that holds at least 12 ounces. A wider mug gives a more even cook.
  2. Mix the wet ingredients. Add the egg, peanut butter, heavy cream, and vanilla to the mug. Whisk with a fork until smooth and glossy.
  3. Add the dry ingredients. Stir in almond flour, coconut flour, sweetener, baking powder, and a pinch of salt. Mix until no dry streaks remain. The batter should be thick but spoonable.
  4. Adjust sweetness and texture. Taste a tiny bit of batter and add more sweetener if needed. If it’s too thick, add 1 teaspoon more cream; if too loose, add 1/2 teaspoon more coconut flour.
  5. Add mix-ins (optional). Fold in a few sugar-free chocolate chips or dust in cinnamon. Don’t overmix.
  6. Microwave carefully. Cook on high for 60 to 90 seconds. Start with 60 seconds, then add 10- to 15-second bursts. The top should look set but slightly glossy in the center.
  7. Rest before eating. Let it sit for 1 to 2 minutes. It continues to firm up as it cools.
  8. Top it off. Add a dollop of whipped cream, a drizzle of warmed peanut butter, or a sprinkle of crushed peanuts for crunch.