This peanut butter mug cake is the ultimate quick-fix dessert for when cravings strike. It’s moist, fluffy, and packed with rich peanut butter flavor, all made in just a few minutes using simple pantry staples. Perfect for a single serving treat, this recipe delivers comfort and satisfaction with almost no effort.

Why You’ll Love This Recipe

This mug cake is incredibly easy to make, requiring minimal ingredients and no special equipment. It’s ready in minutes, making it ideal for late-night cravings or busy days. The texture is soft and tender, with a deep peanut butter taste that feels indulgent while still being simple. You can also customize it easily with different sweeteners or mix-ins to suit your preferences.

Ingredients

(Tip: You’ll find the full list of ingredients and measurements in the recipe card below.)

3 tablespoons smooth peanut butter
1 to 2 tablespoons granulated sugar
1 large egg
1/2 teaspoon baking powder (optional, for extra fluffiness)

Directions

In a small mixing bowl, add the peanut butter, sugar, egg, and baking powder if using. Stir until the mixture is smooth and fully combined.

Lightly grease a microwave-safe mug or ramekin that holds at least 6 ounces. Pour the batter into the mug, making sure there is enough room for the cake to rise.

Microwave on high for 45 seconds. Check the center with a toothpick. If it needs more time, continue microwaving in 10-second intervals until just set.

Remove the mug cake from the microwave and let it rest for about one minute before eating. This helps the texture settle and prevents burning your mouth.

Oven option: Preheat the oven to 180°C (350°F). Grease a 6- to 8-inch oven-safe ramekin, pour in the batter, and bake for 8 to 10 minutes until a toothpick inserted in the center comes out clean.

Servings and timing

Servings: 1 mug cake
Preparation time: 2 minutes
Cooking time: 1 minute (microwave) or 8–10 minutes (oven)
Total time: 5–7 minutes

Variations

For a keto-friendly version, replace the sugar with an equal amount of allulose or another suitable low-carb sweetener.
Add 1 to 2 tablespoons of chocolate chips for a richer dessert.
Stir in a pinch of cinnamon or vanilla powder for extra flavor depth.
Swap peanut butter with almond butter, cashew butter, or sunflower seed butter for a different taste.

Storage/Reheating

This mug cake is best enjoyed fresh. If needed, you can cover and store it in the refrigerator for up to one day. Reheat gently in the microwave for 10 to 15 seconds until warm. Avoid overheating, as it can dry out the cake.

FAQs

Can I make this mug cake without sugar?

Yes, you can use a sugar-free sweetener that measures like sugar for similar results.

What kind of peanut butter works best?

Smooth, runny peanut butter works best for a soft and moist texture.

Can I make this recipe without baking powder?

Yes, baking powder is optional. The cake will still cook, but it will be slightly denser.

Why did my mug cake turn out dry?

It was likely overcooked. Microwaves vary, so always cook in short intervals.

Can I double the recipe?

It’s best to make one serving at a time to ensure even cooking.

Is this mug cake gluten-free?

Yes, since it contains no flour, it is naturally gluten-free.

Can I use a bowl instead of a mug?

Yes, a microwave-safe bowl works well and helps prevent overflow.

Can I add milk to the batter?

If the batter feels too thick, you can add 1 to 2 tablespoons of milk to loosen it.

How do I know when it’s done?

The top should look set, and a toothpick inserted in the center should come out mostly clean.

Can I eat it straight from the mug?

Yes, just allow it to cool slightly before eating to avoid burns.

Conclusion

This peanut butter mug cake is proof that a delicious dessert doesn’t need to be complicated or time-consuming. With just a few ingredients and minutes of effort, you can enjoy a warm, satisfying treat anytime the craving hits. Whether you keep it simple or customize it with your favorite add-ins, this recipe is sure to become a reliable favorite.

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