Today is a great day. It’s Chocolate Peanut Butter Day!

Woot woot!

So what exactly does that mean? Well, it means you are about to be blown away by chocolate and peanut butter recipes (never a bad thing). I’ve joined forces with 31 fellow bloggers to showcase these tasty ingredients all on the same day. My girls Carla from Chocolate Moosey and Miriam from Overtime Cook are orchestrating the whole event, and we want you to join in on social media using #chocPBday, grab more delicious recipe on the Chocolate PB Pinterest board, and best of all… enter to win 1 of 3 prize packs from OXO, King Arthur Flour, and Peanut Butter & Co. in the giveaway below (find it below the recipe)!

But first… Chocolate Peanut Butter Earthquake Cake.

Chocolate Peanut Butter Earthquake Cake


Here’s the deal with this cake – it ain’t purtty.

It’s meant to look like a peanut butter earthquake has come in and wreaked havoc on an innocent chocolate cake. All the while, tasting super rich, moist and delicious.

I found it tasted best when it was served warm, a-la-mode style.

Chocolate Peanut Butter Earthquake Cake

The cake is actually super easy to make, and a riff on the classic earthquake cake.

Just grab a chocolate boxed cake mix, prepare it according to the box’s instructions and pour into your cake pan.

Chocolate Peanut Butter Earthquake Cake

Then combine some butter, cream cheese, peanut butter and powdered sugar and blend until light and fluffy.

Scoop by tablespoons right on top of the cake batter.

Chocolate Peanut Butter Earthquake Cake

Cover the whole cake in creamy peanut butter blobs.

Blobs… it’s such a fun word to say.

Chocolate Peanut Butter Earthquake Cake

Let’s get crazy and throw in some extra chocolate and peanut butter… shall we??

Chocolate Peanut Butter Earthquake Cake

A few (few?) chocolate chips and peanut butter cups for the road please.

The blobs will slowly sink to the bottom as the cake rises up while baking. It takes a little longer to bake than your average cake mix, so have patience.

You’re looking for a slightly jiggly center, nothing that wobbles too much.

Chocolate Peanut Butter Earthquake Cake

The top will have cracks and creases…

Basically looking like an earthquake destroyed your cake.

Throw a little more chocolate peanut butter cups on top. Mmkay? 

Chocolate Peanut Butter Earthquake Cake

The peanut butter blobs form a creamy sweet layer that’s ribboned throughout the moist chocolate cake.

No frosting needed.

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5 from 7 votes

Chocolate Peanut Butter Earthquake Cake

Chocolate Peanut Butter Earthquake Cake tastes best when it's served warm, a-la-mode style!
Prep Time15 mins
Cook Time50 mins
Total Time1 hr 5 mins
Course: Dessert
Cuisine: American
Servings: 20
Calories: 387 kcal
Author: Shawn


  • 1 Chocolate Fudge cake mix, plus ingredients needed to prepare (eggs, oil, water)
  • 1/2 cup butter
  • 8 oz cream cheese, softened
  • 1/2 cup peanut butter
  • 1/2 tsp vanilla extract
  • 3 1/2 to 4 cups powdered sugar
  • 1/2 cup chocolate chips
  • 1 cup chocolate peanut butter cups, halved


  • Preheat oven to 350 degrees F.
  • Prepare chocolate cake mix according to package instructions and pour into a lightly greased 9x13 cake pan, DO NOT BAKE - set aside.
  • Melt butter on stove top until bubbly. Pour into mixing bowl and beat the butter and cream cheese until smooth. Add the peanut butter and vanilla extract, beat till smooth. Add one cup of powdered sugar at a time to bowl, and beat until fully incorporated and mixture becomes light and fluffy.
  • Scoop spoonfuls of the peanut butter mixture onto the chocolate cake batter, all over. Sprinkle with the chocolate chips and peanut butter cups.
  • Bake for 45-55 minutes or until the center is only slightly jiggly. Let cool for 15 to 20 minutes before slicing and serving warm. Top with ice cream if desired! Enjoy!


Calories: 387kcal | Carbohydrates: 49g | Protein: 5g | Fat: 20g | Saturated Fat: 9g | Cholesterol: 26mg | Sodium: 339mg | Potassium: 177mg | Fiber: 2g | Sugar: 39g | Vitamin A: 312IU | Vitamin C: 1mg | Calcium: 64mg | Iron: 1mg
Keywords: cake, Chocolate, Peanut Butter
DID YOU MAKE THIS RECIPE?don't forget to share a picture and mention @iwashyoudry on Instagram or tag #iwashyoudry!

Ready to win some cool prizes?

Peanut Butter Giveaway

A huge thank you to our sponsors! Be sure to follow them on social media:

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Peanut Butter & Co: Website | Facebook | Twitter | Pinterest| Instagram | YouTube

Three lucky winners will win one of the following:

Prize Pack #1: OXO Baking Tool Set: One 3-in-1 Egg Separator, One Bent Icing Knife, One Brownie Spatula, One Cake Tester, One Cookie Spatula, One Cupcake Icing Knife, One Cupcake Corer, One Egg Beater, One Stainless Steel Measuring Cups, One Stainless Steel Measuring Spoons, One Medium Cookie Scoop

Prize Pack #2: King Arthur Flour ingredients: One bag of all-purpose flour, one package of Guittard bittersweet chocolate disks, and one bottle of pure vanilla extract

Prize Pack #3: Peanut Butter and Co. package including: one Dark Chocolate Dreams 6-pack, One Variety 6-pack, and One 31 Days of Dark Chocolate Dreams cookbook

a Rafflecopter giveaway

This giveaway is open to US residents only and will be picked from random draw. Giveaway ends Monday March 31 at 11:59 PM. The winners will be notified via email and have 24 hours to respond. If not, the prize is forfeited and another winner will be chosen.

Want more Chocolate and Peanut Butter?!

Check out these 30 delicious recipes & bloggers!

About the author

Shawn is the Owner and Creator of I Wash You Dry. She loves to create and share simple, family-friendly recipes. Mom to 5 adorable children and dwells in the desert of Southern Utah.
112 Responses
  1. Jessica

    This should be called Volcano Cake. The peanut butter cream cheese filling erupted out of the cake and dripped down over the oven. I baked it in a non-stick cake pan, but followed the 350 degree instructions on the recipe. I wonder if reducing the temp 25 degrees like it says on the cake mix box would have prevented this?

  2. Payoneer $25 Bonus

    I just found your site & we our friends are enjoying it.
    You have written the steps in very simple words.
    Thank you for your great effort.

  3. Dawn

    Like a previous poster, my add in also sunk all the way to the bottom and carmelized. Has anyone else been able to correct that problem?

  4. Sherry

    Just made this cake. It looks delicious. However, it ran over the pan a lot. I used a pan that is a large 9 X 13. My smoke detector is going off!! Kitchen full of smoke. Mess in the oven. I’m sure it will still be good. But I will not be serving to my guests tomorrow!!

  5. Kay

    Just took this out of the oven. I used my Crazy Chocolate Cake recipe and completed per instruction. This cake was amazing. Shared with the gentleman that is painting my husband’s office. He loved it! Sending some home with him to share with his wife. Thank you for sharing your recipe.

  6. Emilija

    I made this recipe last night but used a brownie base instead of the cake it everyone loved it! you just have to cook it for about 35-40mins instead of the 50mins

  7. Joann

    Hi Shawn, I cannot wait to make this delicious looking cake. I do have a question. I was wandering if you could use the peanut butter and chocolate chips (mixed) instead of just the chocolate? I will also add the miniature peanut butter cups. :). Thanks so much and have a wonderful weekend.

  8. Chrissie

    Awesome cake, but I spent longer converting the measurements to ounces/grams so that I could understand it! Please could we have alternative measures for the very English among us. Many thanks

    1. Shawn

      I’m glad you enjoyed the cake! Sorry about having to convert the ingredients over yourself. I can tell you that the cookbook I am releasing in July will have both standard and metric measurements so it will be super easy for everyone to make the recipes. 🙂

    1. Shawn

      Hi Kim, you might be able to make it work, but you’ll want to line each round cake pan with parchment paper so you can easily get them out. I would let them cool completely before taking them out of the pan so the gooey layer doesn’t run everywhere. Good luck!

  9. Max

    I’m sorry, I don’t mean to be rude but the truth is the truth. Looks good can be deceiving. This was the worse cake I ever ate. It was like eating a box of sugar with some chocolate in it. It surprises me that so many said they liked it.

    1. Shawn

      I’m sorry you didn’t enjoy this cake. It’s definitely a cake full of goodies and meant for major indulgence… when eaten in moderation, I think it can be quite enjoyable. 😉

  10. Wendy

    Love this idea with dark choc & PNB together. QUESTION tho: Am I the only one that thinks that much powdered sugar adds sweetness to already sweet? Sounds TOO sweet for me, any suggestions for the top layer (that we blob on)? What if I cut the powdered sugar in half, think it may still work?? Anyone else modified that part of the recipe? Thanks! 🙂

  11. Chels

    Oh my gosh! My roommate and I LOVE LOVE LOVE this cake! In fact, we kind of hate you a little bit because we love the cake so much. True story, I took a huge slice to work with the intention of sharing it, but it never had a chance. All that made it to work was the empty plate and mulling over whether or not I should lick what was left off. We’ve almost finished off the whole thing ourselves. Hellish awesomeness.

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Shawn Syphus

Hi, I’m Shawn and I’m a busy mom of five; pretending to live on a budget. I love to cook, and explore new recipes, but they have to be quick and easy with as few dishes as possible.

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