Chocolate Peanut Butter Mug Cake

Chocolate Peanut Butter Mug Cake is a moist chocolate cake with a molten peanut butter center that bakes up in a mug in the microwave in just one minute!

One-Minute Chocolate Peanut Butter Mug Cake with text overlay.

If you're a fan of chocolate + peanut butter treats, you'll also love Peanut Butter Brownies, Slow Cooker Chocolate Peanut Butter Fondue, and Homemade Peanut Butter Cups!

Today I'm sharing the perfect treat for those days when you're craving a little something sweet but there's nary a cookie or cupcake or piece of candy in the house...Chocolate Peanut Butter Mug Cake!


Did you know that at any given moment, you are just a few short minutes away from straight-up, legitimate CAKE?! It's true.

As long as you're stocked with a few pantry basics, like...

  • Flour.
  • Cocoa powder.
  • Sugar.
  • Baking powder.
  • Vanilla.
  • Chocolate chips.

...and as long as you can rustle up a few items in the fridge...

  • Milk.
  • Butter.
  • Peanut butter.

...then you can whip up a fresh, decadent, piping-hot Chocolate Peanut Butter Mug Cake for one (or more!) in about the same amount of time it would take to scoop a bowl of ice cream!

(And, egg required!)

Close-up of Chocololate Peanut Butter Mug Cake in white mug.

How to Make a Mug Cake

Have you made a microwave mug cake before? They're kind of magical.

For this Chocolate Peanut Butter Mug Cake, you simply:

  1. Stir up your simple ingredients.
  2. Pour your batter into a mug.
  3. Dollop in a swirl of peanut butter and mini chocolate chips.
  4. And set the microwave for a minute!

Before your very eyes, the liquid batter rises up and bakes into a rich, gooey, chocolate cake with a molten peanut butter center.

And yes, it's every bit as good as it sounds.

Aerial view of ingredients and finished recipe on table.

Making Multiple Mug Cakes

If anyone else in the house shares your sweet tooth, you can easily double, triple, or quadruple this recipe.

Simply divide the batter between the corresponding number of mugs and microwave them one at a time.

With each cake only taking one minute to bake, you'll still have dessert ready in a matter of minutes.

Ways to Enjoy It

And it's up to you how you prefer to enjoy these little babies.

You can eat your dessert straight out of the mug (which is what I typically do).

Or if you're feeling fancy and don't mind dirtying one more dish, you can spray your mug with cooking spray before adding the batter and then overturn your cake onto a plate once baked for a quick take on a molten lava cake.

Chocolate Peanut Butter Mug Cake overturned on plate.

Well, hello there, lovely. Don't mind if I do.

Overturned on plate with molten center oozing out.

Regardless of how you choose to serve them, any fan of chocolate and peanut butter won't want to miss these to-die-for mug cakes!

After all, it's hard to beat fresh, hot, chocolate cake goodness, but if anything can, it would be a peanut buttery center.

And the fact that a Chocolate Peanut Butter Mug Cake can be ready -- from start to finish -- in under five minutes?

Well, that sounds like a pretty perfect way to satisfy a rogue sugar craving to me. 😉

More Mug Cakes

One-Minute Chocolate Peanut Butter Mug Cake |

Chocolate Peanut Butter Mug Cake

Chocolate Peanut Butter Mug Cake is moist chocolate cake with a molten peanut butter center baked up in a microwaved mug in just one minute!
Course: Dessert
Cuisine: American
Prep Time: 5 minutes
Cook Time: 1 minute
Total Time: 6 minutes
Servings: 1 mug cake
Calories: 641kcal
Print Pin Rate


  • ¼ cup all-purpose flour
  • 2 tablespoons unsweetened cocoa powder
  • 2 tablespoons sugar
  • ¼ teaspoon baking powder
  • ¼ cup milk, at room temperature
  • 2 tablespoons butter, melted and cooled
  • ¼ teaspoon pure vanilla extract
  • 1 tablespoon creamy peanut butter
  • 1 tablespoon mini chocolate chips


  • In a small bowl, whisk together flour, cocoa powder, sugar, and baking powder until thoroughly, completely combined with no streaks of flour or cocoa powder remaining. Blend in milk, butter, and vanilla until batter is smooth. Pour batter into a 14-ounce (or larger) microwave-safe mug with straight sides.
  • Combine peanut butter and chocolate chips and dollop into the center of the mug, gently pressing down until even with the top of the batter. Microwave on high for 1 minute. Allow to cool for a couple of minutes before serving.


  • A tall, cylindrical mug with straight (not angled) sides will ensure that the cake bakes evenly. I found a 14-ounce mug to be the perfect size to allow the cake to rise up while baking without overflowing. (I filled my mug to the top with water and then transferred the water to a measuring cup to determine its capacity.) If you use a smaller mug, you may want to bake the cake on top of a plate or paper towel to catch any possible overflow.
  • The strength of individual microwaves can vary. The first time you make this recipe, be prepared to experiment a bit to make sure that 1 minute is the perfect length of baking time. The nice thing about this cake is that even if it is undercooked, you don't have to worry about raw eggs!
  • The mini chocolate chips are optional. So is the peanut butter, for that matter. But I don't recommend skipping either. 😉
  • As an alternative to serving straight out of the mug, you may instead spray the mug with non-stick cooking spray before adding the batter, and then carefully overturn the cake onto a plate once baked.


Calories: 641kcal | Carbohydrates: 71g | Protein: 12g | Fat: 38g | Saturated Fat: 20g | Cholesterol: 69mg | Sodium: 314mg | Potassium: 438mg | Fiber: 6g | Sugar: 38g | Vitamin A: 800IU | Calcium: 142mg | Iron: 3.3mg
Made this recipe? I'd love to see on IG!Mention @FiveHeartHome or tag #FiveHeartHome!


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Recipe Rating


  1. 5 stars
    I made this in an I-was-just-at-the-grocery-store-this-morning-why-didn’t-I-get-dessert-ingredients rage. But I had most of these ingredients already–and it was so good that I’m glad I didn’t get stuff at the store because otherwise I wouldn’t have tasted it! (I did have to substitute heavy whipping cream for the milk, but no issues with it.) SO GOOD!

  2. 5 stars
    This is absolutely delicious!! It is the best mug cake I have tried! The cook time is spot on. So simple to make too! Thank you for sharing!

  3. 5 stars
    This was great! If you don’t have chocolate chips on hand, all you have to do is add a little extra sugar to the chocolate cake part 🙂

  4. I have tried different mug cake recipes but never liked how they turned out. I love peanut butter and chocolate together, so I decided to try this one. I followed the directions, and it turned out perfect! This mug cake is absolutely delicious! I love it! Thank you for the recipe!

  5. 5 stars
    Thanks for the great recipe! Probably one of the fluffiest mug cakes I’ve made, the texture was almost like a real cake. Definitely going to make this again!