Microwave Keto Peanut Butter Mug Cake
A single-serving, sugar-free peanut butter mug cake that cooks in just 2 minutes for a fast and satisfying keto dessert. This keto-inspired keto (keto) ready in about 5 minutes layers natural peanut butter, large egg, erythritol sweetener 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 280 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
- 3 tbsp natural peanut butter
- 1 large egg
- 2 tbsp erythritol sweetener
- 2 tbsp almond flour
- 1/4 tsp baking powder
- 1/2 tsp vanilla extract
- a pinch salt
Instructions
- Step 1: In a microwave-safe mug, whisk together 3 tbsp natural peanut butter and 1 large egg until fully combined and smooth, about 30 seconds.
- Step 2: Add 2 tbsp erythritol sweetener, 2 tbsp almond flour, 1/4 tsp baking powder, 1/2 tsp vanilla extract, and a pinch of salt to the mug. Stir well until the batter is uniform with no lumps, about 30 seconds.
- Step 3: Microwave the mug on high for 90 to 120 seconds, watching closely after 90 seconds until the cake has risen and is set but still moist to the touch. Let it cool for 1 minute before enjoying warm directly from the mug.
Equipment for this recipe
Top-rated tools to make this recipe successfully.
Frequently asked questions
How long does Microwave Keto Peanut Butter Mug Cake take to make?
Total time is about 5 minutes (3 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 Keto 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 Keto 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 Keto 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.
Is Microwave Keto Peanut Butter Mug Cake keto?
Yes — this recipe is tagged keto based on its ingredient list. Always cross-check labels for packaged ingredients (sauces, broths, condiments) since formulations vary by brand.
