Microwave Molten Peanut Butter Mug Cake

By AislePrompt Editorial · Published 2026-06-16 · Updated 2026-06-16

A quick and gooey single-serving mug cake with a molten peanut butter center, ideal for a last-minute sweet craving. This American-inspired recipe, ready in about 7 minutes, layers all-purpose flour, granulated sugar, unsweetened cocoa powder into a dessert worth slowing down for — great for weekend baking, holiday tables, or any time you want a sweet payoff at the end of a meal. Each serving lands at about 320 calories and feeds 1, so it slots into a weekend bake or a special-occasion dessert tray. Tap "Plan a meal with the AI" below to drop this recipe into your week and send the ingredients straight to Instacart. Nutrition values are approximate, calculated from USDA FoodData Central (fdc.nal.usda.gov) — verify against ingredient labels for any health-driven dietary plan.

Ingredients

• 4 tbsp all-purpose flour
• 3 tbsp granulated sugar
• 1 tbsp unsweetened cocoa powder
• 1/4 tsp baking powder
• 3 tbsp milk
• 2 tbsp vegetable oil
• 1/4 tsp vanilla extract
• 1 tbsp peanut butter

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Instructions

1. Step 1: In a microwave-safe mug, whisk together 4 tbsp all-purpose flour, 3 tbsp granulated sugar, 1 tbsp unsweetened cocoa powder, and 1/4 tsp baking powder until evenly combined.
2. Step 2: Add 3 tbsp milk, 2 tbsp vegetable oil, and 1/4 tsp vanilla extract to the dry ingredients and stir until smooth and no lumps remain.
3. Step 3: Drop 1 tbsp peanut butter into the center of the batter and gently press down to create a molten filling.
4. Step 4: Microwave the mug cake on high for 70-90 seconds, watching carefully to avoid overflow. The cake should be set on the edges but slightly gooey in the center.
5. Step 5: Let the mug cake cool for 1-2 minutes before enjoying directly from the mug.