Microwave Chocolate Peanut Butter Mug Cake

By , Test Kitchen Director · Reviewed by AislePrompt Editorial · ·

A single-serving chocolate peanut butter cake made quickly in the microwave, perfect for a last-minute dessert 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 350 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.

Prep: 5 min Cook: 2 min Serves 1 American cuisine 350 cal/serving
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Ingredients

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Instructions

  1. Step 1: In a microwave-safe mug, whisk together 4 tablespoons all-purpose flour, 3 tablespoons granulated sugar, 2 tablespoons unsweetened cocoa powder, 1/4 teaspoon baking powder, and a pinch of salt until fully combined.
  2. Step 2: Add 3 tablespoons milk, 2 tablespoons vegetable oil, and 1/4 teaspoon vanilla extract to the dry ingredients. Stir until smooth and no lumps remain.
  3. Step 3: Drop 1 tablespoon peanut butter into the center of the batter, then use a spoon to gently swirl it through.
  4. Step 4: Microwave on high for 70-90 seconds, checking at 70 seconds. The cake should be set but moist; avoid overcooking to keep it tender.
  5. Step 5: Let cool for 2 minutes before enjoying your warm, gooey chocolate peanut butter mug cake.

Frequently asked questions

How long does Microwave Chocolate 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 Chocolate 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 Chocolate 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 Chocolate 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 Chocolate 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.

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