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

pink velvet 1 words

Skinny Mini Mocha Cheesecakes

skinny-mini-mocha-no-bake-cheesecakes 3 words

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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  1. Pingback: Double Chocolate Peanut Butter Mug Cookie – HONEY

  2. Pingback: Coffee Break | Rachel Waxman

  3. I made this yesterday for my boyfriend and I. He turns to me during an episode of Portlandia and says, “This is really good. Like, so good.” We love all of your recipes, but this one was probably his favorite!

  4. Love this Dorothy, as I have all the ingredients in my cupboard I might make this in a few minutes…

  5. An way this could be made with an eggbeater equivalent to one egg instead of a real egg?

    • Yes! I think it totally could. I’m not sure what them measurements are, but I’d say 1/2 an egg (however much egg beaters that is). Whites would work too. I wanted to use that, I just didn’t have any! Let me know what amount you use and how it works!

  6. Absolutely delicious! Mine needed a minute in the microwave though

  7. Pingback: TGIMF: Thank God It’s Microwaveable Friday (Peanut Butter Chocolate Brownie) | Vegan Milwaukee

  8. I’m getting ready to kill my chocolate craving for today with this mug cake. But I have to share something with those of you who have a Whole Foods Market nearby. If you are a PB lover, you MUST TRY the fresh ground honey peanut butter, usually available in their bulk section. I always grind it fresh in the store, although they also have it ready to go as well. It’s something psychological, I guess. haha. I assure you… It.Is.The.Best.EVER!

    • I LOVE their freshly ground PB! And, if you have a food processor, you can make your own too. Just grind peanuts (and honey, if you like) for several minutes and you have PB!

  9. Today I NEEDED a dessert, but I’m too sick to bake. I threw this together (subbed coconut oil for butter, milk for the egg), and it TOTALLY made my day. So gooey and sweet. Thank you for this recipe!

  10. I just stumbled over here from #2 Pencil, her single cookie recipe popped up on my FB page today. I didn’t realize these recipes even existed. I don’t own a microwave but I will share these recipes with my readers. My blog is recipes that have been trimmed down for 1-2 servings.

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