Peanut Butter Cake in a Mug Recipe
Introduction
This Peanut Butter Cake in a Mug is a quick and delicious single-serving treat that can be whipped up in just minutes. Perfect for when you crave something sweet and peanut buttery without the fuss of baking a whole cake.

Ingredients
- 4 tablespoons self-rising flour
- 3 tablespoons granulated sugar
- 4 tablespoons creamy peanut butter
- 3 tablespoons whole milk
- 3 tablespoons salted sweet cream butter, melted
- ½ teaspoon pure vanilla extract
- 1 tablespoon creamy peanut butter (for topping, optional)
Instructions
- Step 1: In a 14-ounce microwave-safe mug, combine the self-rising flour and granulated sugar. Stir well to mix the dry ingredients evenly.
- Step 2: Add the creamy peanut butter, whole milk, melted butter, and vanilla extract to the mug. Stir thoroughly until the batter is smooth and fully incorporated.
- Step 3: Microwave the mug on high for 1 minute 30 seconds to 1 minute 45 seconds, depending on your microwave’s power. The cake should rise and set while staying moist.
- Step 4: Let the cake cool for a few minutes. For an extra creamy topping, add 1 tablespoon of peanut butter on top while the cake is still warm and spread gently as it melts.
Tips & Variations
- Use crunchy peanut butter instead of creamy for added texture.
- Try adding a pinch of cinnamon or cocoa powder to the batter for a flavor twist.
- For a dairy-free version, substitute whole milk with almond milk and use a plant-based butter.
- Make sure to use a sufficiently large mug to prevent overflow while microwaving.
Storage
This mug cake is best enjoyed immediately for the best texture and flavor. If you have leftovers, cover the mug and store in the refrigerator for up to 1 day. Reheat briefly in the microwave, about 20 seconds, to warm through.
How to Serve

Serve this delicious recipe with your favorite sides.
FAQs
Can I use regular flour instead of self-rising flour?
You can use all-purpose flour but you’ll need to add 1 teaspoon of baking powder and a pinch of salt to replace the leavening in self-rising flour.
What if I don’t have a microwave?
This recipe is designed for the microwave for quick results. Alternatively, you could bake the batter in a small oven-safe ramekin at 350°F (175°C) for about 15-18 minutes, checking for doneness with a toothpick.
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Peanut Butter Cake in a Mug Recipe
- Total Time: 5 minutes
- Yield: 1 serving 1x
Description
A quick and easy single-serving peanut butter cake in a mug, perfect for a delicious dessert in just minutes. This microwave cake combines creamy peanut butter with a moist, fluffy texture, topped optionally with melted peanut butter for extra indulgence.
Ingredients
Dry Ingredients
- 4 tablespoons self-rising flour
- 3 tablespoons granulated sugar
Wet Ingredients
- 4 tablespoons creamy peanut butter
- 3 tablespoons whole milk
- 3 tablespoons salted sweet cream butter, melted
- ½ teaspoon pure vanilla extract
Topping
- 1 tablespoon creamy peanut butter (optional)
Instructions
- Combine dry ingredients: Add the self-rising flour and granulated sugar to a 14-ounce microwave-safe mug. Stir thoroughly to mix the dry ingredients evenly.
- Add wet ingredients: Pour in the creamy peanut butter, whole milk, melted butter, and vanilla extract into the mug. Stir everything together well until completely incorporated and the batter is smooth.
- Microwave the cake: Place the mug in the microwave and cook on high for 1 minute 30 seconds to 1 minute 45 seconds, depending on your microwave’s power. The cake should rise and set but remain moist.
- Cool and garnish: Allow the cake to cool for a few minutes. Optionally, add 1 tablespoon of peanut butter on top while the cake is still warm. The heat will melt the peanut butter, allowing you to gently spread it over the surface for an extra creamy topping.
Notes
- Ensure the mug you use is microwave safe and at least 14 ounces in capacity to avoid overflow.
- Do not overcook the cake to prevent dryness; start with 1 minute 30 seconds and increase if needed.
- You can substitute self-rising flour with all-purpose flour plus 1½ teaspoons baking powder and ¼ teaspoon salt if unavailable.
- Use creamy peanut butter for a smooth texture, but natural peanut butter can be used for a healthier option.
- This recipe is perfect for a quick dessert or snack for one person.
- Prep Time: 3 minutes
- Cook Time: 2 minutes
- Category: Dessert
- Method: Microwaving
- Cuisine: American
Keywords: peanut butter mug cake, microwave cake, quick dessert, single serving cake, easy peanut butter cake

