Peanut Butter Sheet Cake

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Peanut Butter Sheet Cake with a fluffy peanut butter frosting.

 

Peanut Butter Sheet Cake is a moist sheet cake topped with a super creamy and sweet peanut butter icing. It is a peanut butter lover’s dream and perfect for potlucks and picnics.

Peanut Butter Sheet Cake with a thick and fluffy peanut butter frosting.

Peanut butter is practically the only food I can eat every single day and not get tired of. I often start my day with a banana and a spoon full of peanut butter. I absolutely love the stuff.

Peanut Butter Sheet Cake with a fluffy peanut butter frosting. Love this for potlucks!

 

Normally when it comes to desserts, I prefer peanut butter paired with chocolate. AKA the best thing ever.

But sometimes a pure peanut butter dessert is just what I’m craving.

Peanut Butter Sheet Cake with a fluffy peanut butter frosting. Love this for potlucks!

 

With peanut butter in the cake batter and the icing, there’s plenty of peanut butter flavor in this peanut butter sheet cake.

It’s baked in a 10×15-inch pan and can easily be cut into 20 pieces so it is perfect for bringing to a summer potluck or picnic.

Peanut Butter Sheet Cake with a fluffy peanut butter frosting.

 

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5 from 1 vote
Peanut Butter Sheet Cake with a fluffy peanut butter frosting.
Print
Peanut Butter Sheet Cake
Prep Time
20 mins
Cook Time
22 mins
Total Time
42 mins
 

Peanut Butter Sheet Cake is a moist sheet cake topped with a super creamy and sweet peanut butter icing. Perfect for potlucks!

Course: Dessert
Cuisine: Southern
Servings: 20 servings
Calories: 432 kcal
Author: Christin Mahrlig
Ingredients
Cake
  • 2 cups all-purpose flour
  • 2 cups sugar
  • 1/2 teaspoon baking soda
  • 1/4 teaspoon salt
  • 1 1/2 (12 tablespoons) sticks butter
  • 1 cup water
  • 1/2 cup peanut butter
  • 1/4 cup vegetable oil
  • 2 eggs
  • 1/2 cup buttermilk
  • 1 teaspoon vanilla extract
Frosting
  • 2 sticks (1 cup) butter, softened
  • 3/4 cup peanut butter
  • 3 cups confectioners' sugar
  • 3 to 4 tablespoons milk
  • 2 tablespoons instant vanilla pudding mix
Instructions
  1. Preheat oven to 350 degrees. Grease a 10x15x1 inch jellyroll pan.
  2. In a large bowl, whisk together flour, sugar, baking soda, and salt.
  3. Combine 1 1/2 sticks butter and 1 cup water in a medium saucepan and bring to a simmer. Sitr to make sure all butter is melted.
  4. Whisk 1/2 cup peanut butter and vegetable oil into butter mixture. Stir into flour mixture.
  5. Whisk together eggs, buttermilk, and vanilla extract. Stir into flour mixture until well combined.
  6. Pour batter into prepared pan.
  7. Bake for 22 to 26 minutes or until a toothpick inserted in middle comes out clean. Let cool.
  8. To make frosting, use an electric mixer to beat butter and peanut butter together until smooth.
  9. Add half of confectioners' sugar and half of milk and beat until smooth.
  10. Add remaining confectioners' sugar, milk and the vanilla pudding mix and beat until smooth. Add a little more milk if necessary.
  11. Spread frosting on cake.

More Potluck Desserts

This Butterfinger Chocolate Lush has an oreo cookie crumb crust, a peanut butter layer with crushed butterfingers, a chocolate pudding layer, and Cool Whip on top.

Butterfinger Lush

Pineapple Sheet Cake

Pineapple Sheet Cake

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14 thoughts on “Peanut Butter Sheet Cake


  1. This was so good! Like omg! I actually have been topping my pieces with fresh strawberries. It compliments the cake and the icing well. Thank you for sharing this blissful recipe!

  2. A great aunt of mine used to make something like this and I have been searching for YEARS to find anything remotely like it! So excited to give this a try!

  3. Hi! I really love peanut butter so I want to try this recipe. The only problem I have here in Puerto Rico is that I can’t find buttermilk anywhere. Can I use regulR milk? Appreciate your response. ?

    1. A reliable substitute for buttermilk is to combine whole milk with vinegar. In this recipe, mix about 1/2 teaspoon vinegar with the 1/2 cup milk.

  4. Oh yum! My son and I are actually going to bake a chocolate sheet cake together this afternoon. This might be even better! Hope you are enjoying the summer.

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