Peanut Butter Mug Cake

4.41 from 15 votes

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This easy peanut butter mug cake is fudgy, moist, made in the microwave, and ready in under 5 minutes. Add in some chocolate chips or an extra drizzle of peanut butter on top for the most delicious mug cake recipe.Peanut butter mug cake is moist, tender & ready in under 5 minutes.

I can’t say no to a peanut butter treat – and when you’re short on time, then this peanut butter mug cake is the perfect treat. It tastes somewhere in between a peanut butter cookie, and a fudgy piece of cake. It’s super moist and has a delicious peanut butter flavor without being too sweet. 

I posted my first mug cake recipe on Just So Tasty only a few months ago. But since then – this vanilla mug cake recipe has been going crazy. So I made the chocolate version next, and since I can’t say no to a peanut butter treat, this peanut butter mug cake recipe had to happen.

How to Make a Peanut Butter Mug Cake A bite of peanut butter mug cake that's moist and tender with chocolate chips.

Mug cakes are so incredible for a few reasons:

  • they’re made in the microwave
  • they only need a few ingredients
  • and are the easiest cake recipes you’ll ever make

For this peanut butter mug cake you’ll need:

  • 1 1/2 tablespoons oil
  • 2 tablespoons peanut butter
  • 2 tablespoons sugar
  • 1 egg yolk
  • 2 tablespoon flour
  • 1/4 teaspoon baking powder
  • 2 tablespoons milk

Add the oil, peanut butter, sugar and egg yolk to your mug and give them a whisk. Gently stir in the flour and baking powder, then whisk in the milk. You can also stir in 1 tablespoon of chocolate chips at this point too. Then to “bake the cake” –  microwave for 1 minute and 30 seconds, or until you see the top start to puff up and it looks set on the top. Microwave peanut butter mug cake with chocolate chips.

How do I make a peanut butter mug cake without egg?

Replace the egg yolk with 1 extra tablespoon of milk. I found that using the egg yolk makes the mug cake extra moist and fudgy, but you can definitely just use milk instead.

Can I turn this into a chocolate peanut butter mug cake?

Absolutely. Simply add in 2 teaspoons of cocoa powder in addition to the flour.

I love this peanut butter mug cake when it’s late at night and I’m craving something sweet. It’s so easy to make, perfectly peanut buttery, and so fudgy and moist.

Peanut butter mug cake topped with ice cream and a drizzle of peanut butter

For more mug cake recipes, don’t forget these favorites:

Or for more easy peanut butter recipes:

Peanut butter mug cake is moist, tender & ready in under 5 minutes.
4.41 from 15 votes

Peanut Butter Mug Cake

This easy peanut butter mug cake is fudgy, moist, made in the microwave, and ready in under 5 minutes. Add in some chocolate chips or an extra drizzle of peanut butter on top for the most delicious mug cake recipe.
Prep: 2 minutes
Cook: 1 minute
Total: 5 minutes
Servings: 1 mug cake
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Ingredients 

  • 1 1/2 tablespoons oil
  • 2 tablespoons peanut butter
  • 2 tablespoons sugar
  • 1 large egg yolk, or 1 extra tablespoon milk
  • 2 tablespoons flour
  • 1/4 teaspoon baking powder
  • 2 tablespoons milk
  • 1 tablespoon chocolate chips

Instructions 

  • Add the oil, peanut butter, sugar & egg yolk to a large mug. Whisk together until smooth.
  • Whisk in the flour and baking powder.
  • Stir in the milk and optional chocolate chips
  • Microwave for 1 minute and 30 seconds or until the top looks set.
  • Let stand for 1-2 minutes to cool slightly, then top with ice cream or a drizzle of peanut butter. 
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Recipe Rating




19 Comments

  1. 2 stars
    I followed the recipe exactly, the flavor was good but the cake was super dry, not fudgy or moist at all 🙁 I was disappointed

  2. 5 stars
    Love this! I’ve made it a couple of times now – so tasty. No chocolate chips available where I am so I’ve substituted with cocoanut or crushed almonds or used crunchy peanut putter. *Always tastes AWESOME* – in my microwave I need circa 2 min 20 secs.

  3. 5 stars
    Excellent! Best taste if you let it cool just a little. Next time I’ll have ice cream with it like you suggested. Thanks for the recipe.

  4. 4 stars
    Tastes pretty good but I’d recommend adding melted Nutella, chocolate sauce or maybe butter? It’s dry without anything else. It’s also best with milk in my opinion! Really easy to make and cooks all the way through.

  5. 5 stars
    SUPER tasty, glad I happened upon this recipe! Only thing I didn’t have on hand was milk, so I substituted water plus powdered buttermilk I had in the pantry.

    Cooked through nicely and are it with a blob of grape jelly on top.

  6. 4 stars
    Overall, this recipe is a win. I made it for my mom and stepdad, and it was a hit. The only thing that was a tad off to me was the texture. It was crumbly and turned into a paste (not a nice feeling) when it went into your mouth. I don’t know if this is just a mistake I made and not really because of the recipe itself. Then again, it was still delicious! Thank you so much for a wonderful recipe! 😉

    PS: it took me a while to finally make up my mind for 4 or 5 stars. I just wanted to let ya know it was very close!