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.  ๐Ÿ˜‰

 

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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Chocolate-Peanut Butter Fun Cake

By Christin Mahrlig

Prep: 20 minutes
Cook: 40 minutes
Total: 1 hour
Servings: 12
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.
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Ingredients

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

Instructions 

  • 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.

Notes

Store airtight at room temperature.

Nutrition

Calories: 334kcal

Nutrition information is automatically calculated, so should only be used as an approximation.

Did you make this?Leave a comment below and tag us @spicysouthernkitchen on social media!

Slightly adapted from Epicurious.

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13 Comments

  1. Krystle says:

    That peanut butter frosting though wow!! Yummy! My birthday is this Sunday HINTHINT ๐Ÿ™‚

  2. Medeja says:

    Chocolate and peanut butter?! This cake is for me ๐Ÿ˜€

  3. Ashley | The Recipe Rebel says:

    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 says:

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

  5. Annie @ The Garlic Diaries says:

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

  6. Sam @ SugarSpun says:

    This is too perfect! I could go for a slice right now, I love the peanut butter/chocolate combo! ๐Ÿ™‚

  7. Ashley says:

    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 says:

    Chocolate, peanut butter and fun….these are truly magical words in my book!! I would inhale this amazing cake! ๐Ÿ™‚

  9. Gayle @ Pumpkin 'N Spice says:

    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 says:

    This looks amazing! I love the chocolate/peanut butter combo and this definitely looks like fun cake ๐Ÿ™‚ Pinning!