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Chocolate-Peanut Butter Fun Cake

Chocolate Peanut Butter Fun Cake is purely magical for lovers of chocolate and peanut butter. A moist and delicious chocolate cake is topped with a buttery and luscious peanut butter frosting.

Slice of Chocolate-Peanut Butter Fun Cake on plate.


I love how the top of the cake looks covered in peanuts and chopped semi-sweet chocolate.


The cake batter is made from all-purpose flour, sugar, cocoa powder, vegetable oil, water, and finely chopped chocolate. With two types of chocolate, this cake is not lacking in chocolate flavor.

Incidentally, the cake batter itself is vegan (although the frosting is not). But if you needed to bake a vegan cake, this batter would be a good one to pair with another frosting.

Slice of cake topped with peanuts on a plate.


The cake does bake up a little bit crumbly in texture, but not at all dry. But it is hard to eat without making a mess. You definitely can’t sneak a piece without leaving a trail.  😉


The peanut butter frosting is light and luscious and is not your typical buttercream frosting. It’s made from sugar, egg whites, peanut butter, and butter and it pairs perfectly with the cake.

If you’re looking for a chocolate-peanut butter dessert, this cake has fun written all over it!


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Slice of Chocolate-Peanut Butter Fun Cake on plate.

Chocolate-Peanut Butter Fun Cake

Chocolate Peanut Butter Fun Cake is purely magical for lovers of chocolate and peanut butter. A moist and delicious chocolate cake is topped with a buttery and luscious peanut butter frosting.
PREP: 20 minutes
COOK: 40 minutes
TOTAL: 1 hour


Cake Batter

  • 1 1/4 cups all-purpose flour
  • 1 cup sugar
  • 3/4 cup unsweetened cocoa powder
  • 1 1/2 teaspoons kosher salt or 1 teaspoon table salt
  • 1 teaspoon baking soda
  • 1/4 cup vegetable oil
  • 1 teaspoon vanilla extract
  • 1/2 cup finely chopped semi-sweet chocolate (3 1/2 ounces)

Peanut Butter Frosting

  • 1/2 cup sugar
  • 1/4 cup egg whites (2 large egg whites)
  • 1 1/2 teaspoons vanilla extract
  • 1/3 cup peanut butter
  • 6 tablespoons unsalted butter cut into 1/4-inch cubes, chilled
  • pinch of salt
  • 1/4 cup finely chopped semi-sweet chocolate
  • 1/4 cup chopped dry-roasted peanuts


  • Preheat oven to 350 degrees. Coat an 8-inch square pan with cooking spray. Line bottom with parchment paper.
  • In a large bowl, whisk together flour, sugar, cocoa powder, salt, and baking soda.
  • Add oil, vanilla extract and 1 1/4 cups water and stir until smooth. Fold in 1/2 cup chopped chocolate.
  • Pour into prepared pan and bake for 35-40 minutes. Cool completely in pan.
  • To make frosting, combine sugar and egg whites in a medium metal bowl set over a saucepan of simmering water. Continuously whisk until sugar dissolves and mixture is hot to the touch, about 3 to 4 minutes.
  • Transfer mixture to the bowl of an electric stand mixer and beat with whisk attachment until cool and thick, about 5-6 minutes.
  • Beat in vanilla extract and then peanut butter.
  • With mixer on medium-high, add butter pieces a few at a time. Beat until butter is completely incorporated. Add a pinch of salt.
  • Run a knife around edges of cake and turn it out onto a plate or cake stand. Peel parchment paper off and top with frosting, chopped chocolate, and peanuts.


Store airtight at room temperature.


Calories: 334kcal
Author: Christin Mahrlig
Course: Dessert
Cuisine: American
Keyword: cake

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Slightly adapted from Epicurious.

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13 thoughts on “Chocolate-Peanut Butter Fun Cake”

  1. Oh goodness, this is the ultimate peanut butter and chocolate dessert! I love that the cake is vegan too! It looks beyond incredible!

  2. June @ How to Philosophize with Cake

    That does look fun indeed! Love all the toppings on there, that is my kind of cake 🙂

  3. Ashley | The Recipe Rebel

    I’m so impressed that the cake is vegan! It looks SO good — I can never resist peanut butter and chocolate!

  4. Carol at Wild Goose Mama

    Dang! This looks TASTY. You can’t beat the classic flavor combo either. AND it looks soooo moist.

  5. Annie @ The Garlic Diaries

    This cake looks amaaaaazing!!! Chocolate peanut butter = heaven. Is there anything better??

  6. Sam @ SugarSpun

    This is too perfect! I could go for a slice right now, I love the peanut butter/chocolate combo! 🙂

  7. What I would give for a piece of this cake right now!! It looks fantastic! Peanut butter + chocolate is the best!

  8. Renee@Two in the Kitchen

    Chocolate, peanut butter and fun….these are truly magical words in my book!! I would inhale this amazing cake! 🙂

  9. Gayle @ Pumpkin 'N Spice

    I love the name of this cake, Christin! Chocolate and peanut butter really make the best combination. And that frosting is just begging to be eaten!

  10. Medha @ Whisk & Shout

    This looks amazing! I love the chocolate/peanut butter combo and this definitely looks like fun cake 🙂 Pinning!

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