Microwave Molten Peanut Butter Mug Cake
A quick and gooey single-serving mug cake with a molten peanut butter center, ideal for a last-minute sweet craving. This american-inspired desserts 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
Instructions
- 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.
- 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.
- Step 3: Drop 1 tbsp peanut butter into the center of the batter and gently press down to create a molten filling.
- 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.
- Step 5: Let the mug cake cool for 1-2 minutes before enjoying directly from the mug.
Equipment for this recipe
Top-rated tools to make this recipe successfully.
Frequently asked questions
How long does Microwave Molten Peanut Butter Mug Cake take to make?
Total time is about 7 minutes (5 min prep + 2 min cook). Most home bakers find this fits a weekend afternoon; chill or store as the recipe directs before serving.
How do I store leftover Microwave Molten Peanut Butter Mug Cake?
Cool fully before storing. Most baked desserts keep at room temperature in an airtight container for 2–3 days, or in the fridge for up to 5 days. Cream- or custard-based desserts must go in the fridge within 2 hours; reheat gently or serve cold per the recipe.
Can I substitute ingredients in Microwave Molten Peanut Butter Mug Cake?
Yes — most ingredients in this recipe have flexible swaps. For oil, use any neutral high-smoke-point oil (avocado, grapeseed, refined coconut). For aromatics, dried herbs at ⅓ the volume of fresh work in a pinch. The full ingredient list is shoppable on Instacart so you can see substitutes in real time.
How do I scale Microwave Molten Peanut Butter Mug Cake for a different number of people?
The recipe is written for 1 servings. Multiply each ingredient by (your serving target / 1). Cook time stays roughly the same up to 2x; for 3-4x batches, switch from a skillet to a sheet pan or stockpot so the food isn't crowded — overcrowding steams instead of browns.
What goes well with Microwave Molten Peanut Butter Mug Cake?
American desserts like this pair well with a simple grain (rice, couscous, or crusty bread), a quick salad with acid (lemon vinaigrette, pickled onions), and a pan sauce or yogurt-based dip. Tap "Plan a meal with the AI" to get specific side suggestions.
