Peanut Butter Sheet Cake with a fluffy peanut butter frosting.
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4.95 from 17 votes

Peanut Butter Sheet Cake

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
Prep Time 20 minutes
Cook Time 22 minutes
Total Time 42 minutes
Servings 20 servings
Calories 432kcal
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

  • Preheat oven to 350 degrees. Grease a 10x15x1 inch jellyroll pan.
  • In a large bowl, whisk together flour, sugar, baking soda, and salt.
  • 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.
  • Whisk 1/2 cup peanut butter and vegetable oil into butter mixture. Stir into flour mixture.
  • Whisk together eggs, buttermilk, and vanilla extract. Stir into flour mixture until well combined.
  • Pour batter into prepared pan.
  • Bake for 22 to 26 minutes or until a toothpick inserted in middle comes out clean. Let cool.
  • To make frosting, use an electric mixer to beat butter and peanut butter together until smooth.
  • Add half of confectioners' sugar and half of milk and beat until smooth.
  • Add remaining confectioners' sugar, milk and the vanilla pudding mix and beat until smooth. Add a little more milk if necessary.
  • Spread frosting on cake.

Nutrition

Calories: 432kcal