Crazy for Crust

Double Chocolate Peanut Butter Mug Cookie

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Perfect for when you just want one dessert not three dozen, this Double Chocolate Peanut Butter Mug Cookie will satisfy your sweet tooth and not ruin your diet (and the peanut butter is optional!)

Double Chocolate Peanut Butter Mug Cookie - a single serving for when you just want something sweet! |

{Hahahahaha. I just said peanut butter optional. #wordsineverthoughtiwouldsay}

Hi everyone! You may not know it but I’ve been kiiiiind of ignoring this space for the last two weeks. All my posts through yesterday were scheduled before Christmas. I wish I could say I’ve just been relaxing on the couch for the past two weeks, soaking up books and movies, but alas. I’ve been arm deep in batter and cheesecake and cookies. Such is life…for another month or so. It’ll be worth it in the end.

Anyway. the other day I asked on Facebook  if I should post a mug cookie or a regular cookie recipe today. And overwhelmingly the answer was MUG! And I’m super glad too, because the cookie recipe is fabulous (coming later this week) but this mug cookie is WOW.

It’s a cookie. For one. In a mug.

It’s a chocolate cookie. With mini chocolate chips. And peanut butter. In a mug. Single-serve. For one.

If you’re not like me and don’t have two identical (but for the failed crust on one) cheesecake bars, a batch of donuts, and three dozen cookies on their counter, and you want something sweet but not a whole batch, this recipe is for you.

Double Chocolate Peanut Butter Mug Cookie - a single serving for when you just want something sweet! |

I adapted an adaption of this chocolate cookie recipe to make this cookie. This is where my nerdy math background (summa cum laude in mathematics, thankyouverymuch, although I laugh when I think about it because I’m so not even close to that level anymore, if I even was) comes in handy. I can convert fractions of cups into tablespoons and teaspoons and divide by 12 or 36 or whatever. It’s actually quite simple…which I know just made about 3/4 of you roll your eyes.

The tricky part is the egg. How do you twelfth an egg? You don’t. You adjust other things so that you can use 1 yolk. It’s just how it is. The beauty of this recipe is that you can make it egg-free by substituting milk or water (1 tablespoon) for the egg yolk. It won’t rise as much or be as rich, but it’ll still be good.

The chocolate and richness of this cookie make it taste like a brownie. A rich fudgy brownie that’s actually a cookie that’s been 36th’d.

The peanut butter is just because I’m…me. Everything is better with peanut butter, especially chocolate and fudgy cookies. I just added a dollop of Super Chunk Skippy Naturals (my favorite brand). You can totally leave it off, or use Nutella or Biscoff or any other nut butter or spread.

It whisks up in a few minutes and cooks in 30 seconds. Perfect when you need chocolate NOW but got rid of it all because it’s January.

Double Chocolate Peanut Butter Mug Cookie - a single serving for when you just want something sweet! |

It’s almost too easy. I’m sorry?

5 from 5 votes
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Double Chocolate Peanut Butter Mug Cookie


  • 1 tablespoon butter — you can substitute butter spread
  • 1 tablespoon brown sugar
  • 1 teaspoon granulated sugar
  • 3 drops pure vanilla extract
  • 1/8 teaspoon baking powder
  • 1 egg yolk — or 1 tablespoon water or milk, but it's won't be as high or as rich
  • 2 teaspoons cocoa powder
  • 1 tablespoon flour
  • 1 tablespoon mini chocolate chips
  • 1 tablespoon peanut butter — creamy or chunky, optional (also try Nutella, Biscoff, or any other spread)


  1. Place butter in an 8-ounce coffee mug (or bigger, but it doesn’t grow much). Melt in the microwave, about 20 seconds. Stir in sugars, vanilla, and baking powder. Stir in egg yolk, coca, and flour. Stir in chocolate chips. Place peanut butter in the center and press it down slightly into the batter.
  2. Heat in the microwave for 30 seconds. Let cool slightly before eating.

Click here to see more PEANUT BUTTER recipes!

Single Serve Mug Coffee Cake


Pink Velvet Cupcakes for Two

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Skinny Mini Mocha Cheesecakes

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Sweets from friends:
Peanut Butter Cake for One by Picky Palate
Single-Serve Peanut Butter Rice Krispie Treats by Something Swanky
Chocolate Chip Cookie in a Cup by No. 2 Pencil
Fudgy Chocolate Mug Brownie by Averie Cooks

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  4. Can it be baked in a regular oven? I dont use microwave

  5. This is delicious! It’s so chocolaty (I added an extra Tablespoon mini-chocolate chips). I have tried other mug recipes but always felt they were much too large. This is the perfect serving! My only complaint is that is a little dry. Next time, I will use 1 whole egg instead of just the yolk. Also, I stirred the peanut butter in. Thank you for satisfying my late night chocolate craving!

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  9. I really can’t emphasize enough to the people of cyberspace how good this was.

    It is so good that I want to stop typing this just so I can finish eating it!

    Thanks for posting this

  10. I did not roll my eyes. In fact I was a little green with envy. Gonna try this.

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