This Peanut Butter Mug Cake is moist, indulgent, and only takes 5 minutes to throw together. Even better, this easy mug cake is a kid-friendly recipe! Birdseye view of a mug cake in a blue mug with chocolate drizzled over the top and a spoon sitting on top

Peanut Butter Cake in a Cup

Peanut Butter Mug Cake! Now that I have your attention, I have a delightful little recipe for you, for those days when you really want a cosy dessert but you forgot to prepare anything.

Who doesn’t love a cute mug dessert — aka a delicious miniature cake for one made in just minutes, perfectly portioned so that all you need to do is find a spoon and a comfy space on the couch?

I used to think my One-Bowl Chocolate Cake was easy, but then I created this microwave cake recipe and now I’m hooked. Made from scratch, fluffy, and flavorful, I bet you have all the ingredients you need for this recipe on hand right now.

Plus, peanut butter and chocolate chips — like in these Peanut Butter Muffins or this gorgeous Peanut Butter Cheesecake Dip — are just the best of friends.  Is there a more perfect couple?

Two blue mugs filled with cake and surrounded by choco chips and spoons

What’s in This Peanut Butter Mug Cake?

Now, microwave mug cakes are only small and we’re trusting the microwave to cook it perfectly, so it’s important to get the right balance of ingredients. Here’s what you’ll need to make this easy mug cake:

  • Peanut butter and chocolate are of course the main flavour components here.
  • Vegetable oil helps to keep the mug cake moist – no dry mug cakes here.
  • Egg white gives the cake structure and helps it to be light and fluffy.
  • This mug cake recipe uses brown sugar for enhanced flavor and also moisture.
  • Finally, cake regulars, flour and baking powder do the job of structure and lift.

Can I Make a Mug Cake Without an Egg?

Yes, you can make this eggless and use milk instead, but the texture is much better using the egg white.

A collage of 3 images showing the stages of making a mug cake

How to Make a Mug Cake

Mug desserts are as easy as it gets. Here are the basic steps to making this microwave cake in a cup:

  1. Start by combining the wet ingredients and sugar in a large mug. Give it a good whisk with a fork.
  2. Add the dry ingredients and mix until just combined
  3. Cook on high for 70 seconds, then devour at will.

How Much Does This Recipe Make?

There’s no getting around it, this peanut butter mug cake is a decadent treat and the recipe fills a regular mug – about 1 cup worth of cooked cake. Perfect as a decadent dessert, but if you want smaller ones, you can certainly divide the batter between two ramekins.

And while this batter is made directly in the cup (read: only 1 cup, 1 fork, and 1 spoon to wash up), you could make a bigger batch in a bowl and then pour it into the cups – great idea if you have more than a couple to make.

An even better option would be, if you have kiddies, to get them involved making their own little dessert. Mug cake is a brilliant kid-friendly recipe, being safe for even the real littles to make and teaching them about combining ingredients all at the same time.

A spoon scooping cake out of a mug

Mug Cake Variations to Try

Want to shake things up a bit? Here are some ways you can customize this peanut butter mug cake recipe and make it your own:

  • Chocolate chips – swap the milk chips for semi-sweet or even white. Both go well with peanut butter.
  • Gooey centre – if you really want to dial it up a notch, push a lindt ball into the top before it cooks for a molten, gooey chocolate centre.
  • A little drizzle – I like to drizzle chocolate over the top of mine but you can drizzle peanut butter if you prefer. Or why not add a dollop of ice cream or jelly once it’s cooked.
  • Peanut butter swap – you can swap the peanut butter in this mug cake for Nutella, cookie butter, or any other nut butter too.

Two blue mugs filled with cake and surrounded by choco chips and spoons

Tips for Making a Microwave Mug Cake

  • Microwaves vary, so the cooking time may vary too. Test it after a minute then add 10 second increments until you have your perfect timing worked out. It’s ready when you touch the top lightly and it doesn’t create a deep dent.
  • If you are cooking more than one mug cake at a time, they will take longer to cook
  • If you split the batter for one into two ramekins, they will cook much quicker.

I think that’s everything you need to know to go and make a delicious little Peanut Butter Mug Cake right now. What are you waiting for?

More No-Bake Dessert Recipes:

Peanut Butter Mug Cake

4.23 from 99 votes
Servings: 1
Prep Time: 4 minutes
Cook Time: 1 minute
Total Time: 5 minutes

Description

This Peanut Butter Mug Cake is moist, indulgent, and only takes 5 minutes to throw together. Even better, this easy mug cake is a kid-friendly recipe! 

Ingredients 

  • 1 1/2 Tablespoons Vegetable Oil
  • 2 1/2 Tablespoons Brown Sugar
  • 1 Egg White , (from a large egg)*
  • 2 1/2 Tablespoons Creamy Peanut Butter
  • 3 Tablespoons All-Purpose Flour
  • 1/4 teaspoon Baking Powder
  • 1 Tablespoon Chocolate Chips

Instructions

  • Combine the oil, sugar, and egg white in a mug and whisk well with a fork until fully combined.
    1 1/2 Tablespoons Vegetable Oil, 2 1/2 Tablespoons Brown Sugar, 1 Egg White
  • Add the peanut butter and mix well again.
    2 1/2 Tablespoons Creamy Peanut Butter
  • Add the flour, baking powder, and chocolate chips and mix until just combined.
    3 Tablespoons All-Purpose Flour, 1/4 teaspoon Baking Powder, 1 Tablespoon Chocolate Chips
  • Cook in the microwave on high for 1 minute & 10 seconds (see notes below).

Notes

  1. Egg white: you can swap the egg white for 2 tablespoons of any milk but egg white definitely gives the best texture.
  2. Cooking time: This will vary depending on the wattage of your microwave so test at 1 minute first, then increase in 10 second increments until you've found your perfect cook time.
  3. More than one: The cooking time will also vary if you cook more than one mug cake at a time.
  4. Smaller Cakes: Batter can be divided into ramekins for smaller cakes but these will take less time to cook.

Nutrition

Serving: 1gCalories: 704kcalCarbohydrates: 65gProtein: 16gFat: 45gSaturated Fat: 24gCholesterol: 2mgSodium: 253mgPotassium: 449mgFiber: 3gSugar: 42gCalcium: 103mgIron: 2mg
Author: Sweet Basil
Course: Dessert
Cuisine: American
Birdseye view of a mug cake in a blue mug with chocolate drizzled over the top and a spoon sitting on top
This Peanut Butter Mug Cake is moist and indulgent and only takes 5 minutes to throw together. Even better, mug cake is a great kid-friendly recipe. #ohsweetbasil #mugcake #mugcakerecipe #peanutbuttercake