Peanut Butter Mug Cake
This peanut butter mug cake is a quick and easy single-serving dessert that's perfect for satisfying your sweet tooth in minutes. Made with creamy peanut butter, brown sugar, a little cinnamon, and vanilla, this soft and fluffy cake comes together right in a mug and cooks in the microwave in just over a minute.
It's perfect for those evenings when you want something sweet without making an entire cake or dirtying a bunch of dishes- just like my pumpkin chocolate chip mug cake. Just mix, microwave, and enjoy it warm!
The peanut butter gives the cake a rich, nutty flavor, while the brown sugar adds a hint of caramel sweetness. Add a handful of semi-sweet chocolate chips for little pockets of melted chocolate, and you've got a delicious dessert that feels like a warm peanut butter cookie in cake form.
And if you love peanut butter flavored sweet treats, don't forget to try my peanut butter fudge recipe too.
Quick Look: Peanut Butter Mug Cake
- 🥜 Prep time: 5 minutes.
- 🔥 Cook time: 1-2 minutes.
- 🍰 Servings: 1.
- 🥣 Main ingredients: Peanut butter, all-purpose flour, milk, butter, brown sugar, and vanilla.
- ➡️ Method: Mix wet ingredients → add dry ingredients → stir in chocolate chips → microwave → enjoy warm.
- ⭐ Difficulty: Easy.
- 🍫 Best served with: Chocolate chips, a scoop of vanilla ice cream, whipped cream, or a drizzle of Dulce de Leche.
Jump to recipe
Why This Recipe
- Ready in minutes: This mug cake cooks in the microwave in about 60-70 seconds, making it perfect for quick dessert cravings.
- Easy pantry ingredients: You probably already have most of the ingredients in your kitchen.
- Customizable: Add chocolate chips, chopped brown sugar candied walnuts, or a drizzle of chocolate sauce to make it your own.
Recipe Ingredients
Flour + baking powder: The duo that gives the mug cake structure and helps it rise.
Peanut butter: Peanut butter is the star ingredient here, adding richness, flavor, and moisture. Creamy peanut butter works best because it mixes easily into the batter.
Butter: Melted butter adds richness and helps keep the cake tender.
Brown sugar: Brown sugar sweetens the cake and adds a subtle caramel flavor that pairs beautifully with peanut butter. Sometimes, I like using my homemade date sugar whenever I have it at hand.
Cinnamon: A little cinnamon adds warmth and complements the nutty flavor of the peanut butter.
Vanilla extract: Vanilla enhances the sweetness and rounds out the flavor of the cake.
Milk: Milk brings the ingredients together into a smooth batter and adds moisture.
Salt: A small pinch of salt balances the sweetness and brings out the peanut butter flavor.
Semi-sweet chocolate chips: These are optional, but they add delicious pockets of melted chocolate throughout the cake.
Check recipe card for quantities.
Substitutions & Variations
- Use crunchy peanut butter: If you prefer a little texture, crunchy peanut butter adds small pieces of peanuts throughout the cake.
- Make it extra chocolatey: Stir semi-sweet chocolate chips into the batter or sprinkle a few over the top before microwaving.
- Add chopped peanuts: A tablespoon of chopped roasted peanuts gives the cake extra crunch.
- Swap the cinnamon: Leave it out if you prefer a more classic peanut butter flavor, or add a tiny pinch of nutmeg or dried ginger instead.
- Use a different nut butter: Almond butter or cashew butter can work as alternatives, although the flavor and texture will vary.
How to Make Peanut Butter Mug Cake
Step 1: Add melted butter, peanut butter, brown sugar, milk, and vanilla extract to the mug. Mix until everything is well combined.
Step 2: Add all-purpose flour, baking powder, cinnamon, and a pinch of salt to the mug.
Step 3: Mix until you have a smooth batter with no visible flour lumps remaining. Scrape the sides and bottom of the mug to make sure everything is evenly combined.
Step 4: Place the mug in the microwave and cook on high for 60-70 seconds. Add the chocolate chips and let it cool down slightly before serving.
Shahida's Tips & Tricks
- Use a large enough mug. A 12-14-ounce microwave-safe mug gives the cake room to rise without overflowing. I do this when I make my single serve berry crisp too.
- Make sure the melted butter isn't piping hot before mixing it with the other ingredients.
- Whisk the wet ingredients thoroughly before adding the flour so the peanut butter is evenly distributed. Mix until no flour lumps remain, paying special attention to the bottom and sides of the mug.
- Don't overmix once the batter is smooth, as excessive mixing can make the cake dense. I realized this when I made my banana pumpkin muffins too.
- Add chocolate chips at the end so they stay distributed throughout the batter.
- Start with 60 seconds of microwave time. You can always cook it a little longer, but you can't undo an overcooked mug cake.
- Let the cake rest for a minute or two before eating. The mug will be hot, and the cake will continue to settle as it cools slightly.
How to Serve Peanut Butter Mug Cake
Sprinkle a few extra semi-sweet chocolate chips over the warm cake so they soften slightly before you dig in or top the warm mug cake with a small scoop of vanilla ice cream. The contrast between the warm cake and cold ice cream makes this an especially delicious dessert. This is something I always do with my condensed milk brownies and single serve mug brownie too.
You can also serve with sliced bananas or strawberries for a fresh, fruity contrast to the rich peanut butter cake.
Troubleshooting & FAQs
If you do have leftovers, cover the mug and refrigerate the cake for up to 1 day. The texture will become firmer as it cools.
The most common reason is overcooking. Microwave cakes cook very quickly, and even an extra 20-30 seconds can make a difference. Start with 60 seconds and add more time in short intervals if needed.
It's best to mix and cook the batter just before serving. Baking powder starts working once it comes into contact with moisture, so leaving the batter to sit can affect how well the cake rises.
More Easy Fall Treats
If you tried this peanut butter mug cake or any other recipe on my website, please leave a 🌟 star rating and let me know how it went in the 📝 comments below. Thanks for visiting!
Peanut Butter Mug Cake
Ingredients
- ¼ cup all-purpose flour
- 3 tablespoons peanut butter
- 1 tablespoon butter melted
- 1 tablespoon brown sugar
- ¼ teaspoon baking powder
- ¼ teaspoon cinnamon
- ½ teaspoon vanilla extract
- ¼ cup milk
Instructions
- In a microwave-safe mug (12-14 ounces), add the melted butter, peanut butter, brown sugar, milk, and vanilla extract.
- Whisk vigorously until the mixture is well blended.
- Add the flour, baking powder, cinnamon, and salt.
- Mix until smooth, making sure no flour lumps remain.
- Stir in the chocolate chips, if using.
- Microwave on high for 60-70 seconds, until the top looks set.
- Let the cake rest for a minute or two, then enjoy warm.
Notes
- Use a 12-14-ounce microwave-safe mug to prevent the cake from overflowing.
- Creamy peanut butter gives the cake a smooth texture, while crunchy peanut butter adds extra texture.
- Start with 60 seconds of microwave time and add more in 10-second intervals if needed.
- Avoid overcooking, as this can make the cake dry and rubbery.
- Chocolate chips are optional but add delicious pockets of melted chocolate.
- The mug and cake will be hot after microwaving, so let the cake rest briefly before eating.
- This mug cake is best enjoyed fresh and warm.
