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Peanut Butter Sheet Cake with Peanut Butter Frosting

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This peanut butter sheet cake with peanut butter frosting is a moist, tender cake full of nostalgic flavor. Topped with a rich, smooth frosting that melts into the cake, it’s the perfect dessert for gatherings or satisfying a peanut butter craving.

  • Author: Ella
  • Prep Time: 15 minutes
  • Cook Time: 25 minutes
  • Total Time: 50 minutes
  • Yield: 15-20 servings
  • Category: Dessert
  • Method: Bake
  • Cuisine: American
  • Diet: Vegetarian

Ingredients

  • 2 cups all-purpose flour
  • 2 cups granulated sugar
  • 1 tsp baking soda
  • 1/2 tsp salt
  • 2 large eggs
  • 1/2 cup sour cream or Greek yogurt
  • 1/2 cup milk
  • 1 cup creamy peanut butter
  • 1/2 cup unsalted butter
  • 1 cup water
  • 1 tsp vanilla extract
  • For the frosting:
  • 1/2 cup unsalted butter
  • 1/2 cup creamy peanut butter
  • 1/3 cup milk
  • 3 cups powdered sugar
  • 1 tsp vanilla extract
  • Pinch of salt (optional)

Instructions

  1. Preheat oven to 350°F (175°C) and grease a 9×13-inch baking pan.
  2. In a large bowl, whisk together flour, sugar, baking soda, and salt.
  3. In a saucepan, combine peanut butter, butter, and water. Bring to a light boil, then remove from heat and stir into the dry ingredients.
  4. In a separate bowl, whisk eggs, sour cream, milk, and vanilla. Stir into the batter until smooth.
  5. Pour batter into prepared pan and bake for 22–25 minutes, until a toothpick inserted in the center comes out clean.
  6. For the frosting, melt butter and peanut butter in a saucepan. Stir in milk and vanilla. Remove from heat and whisk in powdered sugar until smooth.
  7. Pour warm frosting over warm cake and spread evenly. Let cool and set before serving.

Notes

  • Top with chopped peanuts or mini chocolate chips for texture.
  • Use Greek yogurt instead of sour cream for a lighter version.
  • Store at room temperature or refrigerate; freezes well in slices.
  • Adjust frosting sweetness by reducing powdered sugar and adding a pinch of salt.
  • Turn into cupcakes by baking in muffin tins for 15–18 minutes.

Nutrition

Find it online: https://elladishes.com/peanut-butter-sheet-cake-with-peanut-butter-frosting/