Mug Cakes for One
Peanut Butter Mug Cake
One soft peanut butter mug cake with a moist fluffy crumb, rich nutty flavor, and an easy microwave batter ready in minutes.
Servings
1 mug cake
Prep
5 min
Cook
1–2 min
Total
6–7 min
Difficulty
Easy
Calories
≈ 420 kcal
Protein
≈ 10 g
Fat
≈ 21 g
Carbs
≈ 49 g
Nutrition information is an estimate and may vary depending on the ingredients and brands used.
Ingredients
What you'll need.
- All-purpose flour30 g
- Granulated sugar18 g
- Baking powder¼ tsp
- Fine saltPinch
- Creamy peanut butter25 g
- Milk35 g
- Unsalted butter, melted10 g
- Vanilla extract½ tsp
How to Make It
One peanut butter mug cake, step by step.
- 01
Choose the mug
Use a microwave-safe mug with enough room for the cake to rise slightly while cooking.
- 02
Mix the dry ingredients
Add the flour, sugar, baking powder, and salt to the mug. Stir until evenly combined.
- 03
Add the peanut butter
Add the peanut butter, milk, melted butter, and vanilla extract. Stir until the batter is smooth and no dry pockets remain.
- 04
Smooth the top
Gently smooth the surface of the batter so the mug cake cooks as evenly as possible.
- 05
Microwave the cake
Microwave on high for about 60–90 seconds, depending on your microwave. The top should look set while the center remains soft.
- 06
Let it rest
Let the mug cake sit for 1–2 minutes before eating. It will continue to set slightly from the residual heat.
SVI SWEET Tip
Peanut butter mug cake is best slightly undercooked.
Peanut butter naturally makes the batter rich and dense, so overcooking can quickly make the cake dry. Stop as soon as the surface looks set and let it finish resting outside the microwave.
Substitutions
Make it work with what you have.
Peanut butter
Smooth conventional peanut butter gives the most consistent texture. Natural peanut butter can also work, but differences in oil content may change the final crumb.
Milk
Regular dairy milk or an unsweetened plant-based milk can be used in the same amount.
Butter
A neutral-flavored oil can replace the melted butter in the same quantity.
Add-ins
A small spoonful of chocolate chips or chopped peanuts can be folded into the batter for extra texture.
Storage
Best enjoyed right away.
Fresh is best
This peanut butter mug cake is best eaten shortly after cooking while the center is still warm and soft.
Short-term storage
If needed, cover the cooled mug cake and keep it at room temperature for a few hours.
Reheating
Microwave for about 5–8 seconds to warm it again. Avoid overheating, which can make the cake dry.
FAQ
A few helpful answers.
Can I use natural peanut butter?
Yes, although the result may vary because natural peanut butter can contain more separated oil. Stir it very well before measuring.
Why did my peanut butter mug cake turn dry?
The most likely cause is overcooking. Microwave power varies, so start with the shorter cooking time and add only a few seconds if needed.
Can I add chocolate chips?
Yes. Peanut butter and chocolate work especially well together, so a small spoonful of chocolate chips is an easy variation.
Can I double the recipe?
For more even microwave cooking, make two separate mug cakes rather than doubling the batter in one mug.
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