Chocolate Peanut Butter Mug Cake

by Erin

Treat yourself to this easy, microwaveable, single serving chocolate peanut butter mug cake topped with even more peanut butter and chocolate.

Chocolate Peanut Butter Mug Cake

Jump to recipe

After last week’s win against Penn State in the affectionately named “Ineligibowl“, I am feeling quite good about this season. You would think I’d have that sense already by being 9-0 but to me winning isn’t everything, it also matters how well we win.

After barely beating Purdue the week before in overtime I wasn’t feeling all that great about it. Hopefully today’s game versus Illinois won’t produce a headache. If we can get through the next two games (Bye week next weekend, followed by Wisconsin), then it’s on to that state up north, M*chigan.

Pardon my use of a bad word (although I understand that only OSU fans will really understand why it is a bad word).

Buckeye Mug Cake for One

My body is still recovering from my accident-prone-ness at last weekend’s tailgating (sliced open my finger on a beer can, and pulled a tendon in my foot), so for today’s game I went with a much more low-key treat. I made a single serving cake that is magically baked in the microwave for a minute!

Do you realize how dangerous this mug cake phenomenon just became in my hands? I have seen various versions of mug cakes floating about the internet but didn’t cave until I found this one with a peanut butter mousse on top. It takes a little more effort because of that addition, but it is beyond worth the extra 2 minutes of time it takes to prepare.

However, if you happen to be serving more than just yourself I suggest making my dark chocolate peanut butter cup cake.

Microwave Chocolate Peanut Butter Mug Cake

Chocolate Peanut Butter Mug Cake


Yield: 1 serving Prep Time: Cooking Time:
Nutrition facts: 200 calories 20 grams fat



  • 2 Tbsp vegetable oil
  • 2 Tbsp creamy peanut butter
  • 1 egg, room temperature
  • 2 Tbsp sugar
  • 1/2 tsp vanilla extract
  • 3 Tbsp cocoa powder
  • 2 Tbsp all-purpose flour
  • 1/8 tsp baking powder
  • 1/8 tsp salt
  • 2 Tbsp peanut butter chips


  • 1 Tbsp cream cheese, room temperature
  • 1 Tbsp creamy peanut butter
  • 2 Tbsp whipped cream
  • 1/2 tsp vanilla extract
  • 1 Tbsp powdered sugar
  • Hot fudge, for topping
  • Buckeye candies, for topping


  1. In a small bowl, blend together the oil and peanut butter; set aside.
  2. In a 12 ounce mug, whisk together the egg, sugar, and vanilla until well combined. Add the cocoa, flour, baking powder, and salt and whisk until blended. Pour in the peanut butter mixture and mix well. Fold in the peanut butter chips.
  3. For the mousse, in a small bowl mix together the cream cheese, peanut butter, cream, and vanilla. Whisk in the powdered sugar; set aside.
  4. Put mug in the microwave for 1 minute or until desired doneness is reached. Top with peanut butter pie mousse, hot fudge, and a buckeye if desired.
Did You Make This Recipe?
I want to see! Tag me on Instagram at @TheSpiffyCookie and hashtag it #TheSpiffyCookie.

Post updated 1/1/2022, photos above and below are the originals.

Did you make this recipe? I want to see! Tag @THESPIFFYCOOKIE on Instagram and hashtag it #THESPIFFYCOOKIE

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Jessica@AKitchenAddiction November 5, 2012 - 5:48 pm

Love the peanut butter mousse!

Tara @ Chip Chip Hooray November 5, 2012 - 1:58 pm

Oh heck YES. Dessert tonight, done and done. I love mug cake!

Tracey November 5, 2012 - 8:02 am

Oh my word, that is heaven in a mug. So, so dangerous! I’ve never tried a mug cake but I’m not sure I can resist this one!

sally @ sallys bakingaddiction November 5, 2012 - 5:02 am

OMG Erin I had no idea that you hurt your finger! Sorry if I read over that in a blog post. I hope you’re doing alright. that sounds SO painful! And of course, to be in a tailgating environment does not help! sending much love! this PB cake would undeniably make e feel better though!

Danielle @ Runs with Spatulas November 3, 2012 - 5:30 pm

Mmmm this looks so good! Love the chocolate peanut butter combo!

Alex November 3, 2012 - 1:11 pm

ui, I’ve never tried it with peanut butter….. This is a SERIOUS mug cake!

Peggy November 3, 2012 - 10:17 am

I’ve seen several versions of mug cake floating around, but this might have to be the best one! Can’t wait to try it =)

Kayle (The Cooking Actress) November 3, 2012 - 9:53 am

I want to just shmush my face inside that bowl and vacuum up all of that goodness bc OMG


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