Kirbie's Cravings

Peanut Butter Mug Cake

close-up photo of a Peanut Butter Mug cake

It’s been a rough couple of weeks at work, with no end in sight. As a result, not much baking has been happening.

Deadlines and a ton of work, while unpleasant, I can still handle. What I can’t stand is the yelling. Lots of yelling and unfair blame for anything and everything that goes wrong during the stressful period. The Boss yells. Because he can I guess. He yells for things out of our control, for things we should have anticipated even though he didn’t, for mistakes made on things we were never taught, etc. All the yelling has led to a really really tense environment.
photo of a spoonful of Peanut Butter Mug cake
When I’m in these stressful moments, I crave sweets like crazy. Chocolate, brownies, cookies, cake, anything. So even though I’ve been too exhausted for baking, I’ve been able to make these simple mug cakes to de-stress when I come home. A few minutes of mixing, and 2 minutes of microwave cooking and these are ready to be eaten.

After successfully making biscoff mug cake, I realized that I could apply the same recipe to a peanut butter mug cake. I have to say, even though peanut butter may not be my favorite flavor, the texture of this case came out so perfect, one of the best ones in my mug cake series.  Moist, fluffy, I couldn’t stop eating this.
overhead photo of a Peanut Butter Mug cake
This one baked up a bit higher than previous versions because the mugs I was using were too small. You definitely need either an oversized mug, or divide the batter into two regular sized mugs or else it will overflow. The smell of peanut butter while these cooked was quite nice too.

For an updated, lower calories and eggless version of this peanut butter mug cake, click here.

You can view my entire mug cake recipe collection here.

Update: If you enjoy this recipe, I just finished writing an entire book on mug cakes, featuring nearly 100 recipes.

To order the book, check out the list of online retailers.


You might like my banana mug cake and chocolate peanut butter mug cake, too!

Peanut butter Mug Cake

Servings: 1
Prep Time: 5 minutes
Cook Time: 2 minutes
Total Time: 7 minutes
Course: Dessert
Cuisine: American
If you love peanut butter you will love this cake!
Note: I have an updated Eggless Peanut Butter Mug Cake version, so be sure to check it out.


  • 4 tbsp all purpose flour
  • 4 tbsp white granulated sugar
  • 1/4 tsp baking powder
  • 1 egg
  • 3 tbsp peanut butter
  • 3 tbsp milk
  • 3 tbsp vegetable oil


  • Combine all ingredients in an oversized coffee mug. Whisk well with a small whisk until smooth. 
  • Microwave on high for 1 1/2 minutes and then take it out to check to see if it is done. If not, continue to microwave in thirty-second intervals. Mine was done at 2 minutes. You don’t want to overcook it or it will become rubbery. 
  • You can also make this into two smaller-sized mugs. You can mix the batter all in one mug and then pour half into another mug. Make sure you cook each one individually.

The nutrition information provided are only estimates based on an online nutritional calculator. I am not a certified nutritionist. Please consult a professional nutritionist or doctor for accurate information and any dietary restrictions and concerns you may have.

Did you make this recipe?I'd love to see it! Mention @KirbieCravings and tag #kirbiecravings!

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104 comments on “Peanut Butter Mug Cake”

  1. It’s really yummy and moist!!

  2. Woooooooowwwww this recipe was amazing???

  3. I made this with natural peanut butter and it was pretty bland. I recommend that you use the kind with sugar and salt in it!

    • I made this with regular Skippy’s, as you can see the jar in the background. Definitely, if you plan on using natural pb with no salt or sugar you may need to adjust and add some in the recipe.

  4. This recipe always works for me, turns out delicious and good looking mug cake~ thanks 🙂

  5. This did not work for me… I followed the instructions and everything im just really unsure what i did wrong

    • Can you please provide a little more explanation when you say it didn’t work? Then I might be able to help pinpoint the problem. Did it not cook? not rise? too dry? too hard? etc

  6. Just made this and it’s awesome, thank you tbh fam, you are the best mugcakiërstein on the internet

  7. hi Kirbie. I am a fan of your blog and I have to say you inspire me a lot on your mug cake recipes. I have tried this  recipe and it was really good.  Thank you so much.  you can see my mug cakes here on my blog 🙂

  8. I’m so glad I found this recipe. I love it! And it’s all mine when I make it because my husband doesn’t like pb.

    (I’m sharing your link on my blog so others can have this wonderful recipe too.)

  9. so I made this mug cake and I honestly did not like it at all… I do however love your peanut butter and jelly mug cake!

    • the pb &j is an updated version of this one. I think this one is still fine, it’s quite rich though, which is why I created a newer one

  10. My 11 yr old found and made this tonight (with help) and is in heaven.. Fyi his hamater snuck some  bites too lol 

    • lol! I think this is the funniest thing I’ve heard in awhile. I totally have this image in my mind of this adorable hamster. I wish you had a video!

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