Peanut Butter Cake
Prep time
Cook time
Total time
peanut butter sheet cake with fudge filling topped with small peanut butter cups
Recipe type: Dessert
Serves: 20 servings
  • 2 cups granulated sugar
  • 4 eggs
  • 2 1/2 cups all-purpose flour
  • 2 1/2 teaspoons baking powder
  • 1 cup milk
  • 1/2 cup butter, melted and cooled
  • 1 tablespoon oil
  • 1/2 cup peanut butter, melted slightly (about 20 seconds in the microwave)
  • 2 teaspoon vanilla extract
fudge filling (I made a chocolate gravy more info on that in my Chocolate Gravy Post)
  • 2 tablespoons butter
  • 1/4 cup flour
  • 2 cups milk
  • 1/2 cup sugar
  • 1/4 cup cocoa (I use dutch process cocoa)
  • pinch of salt
  • 1 cup chocolate chips (I use 60% cacao chips for a delicious dark chocolate flavor)
peanut butter frosting
  • 1/2 cup butter
  • 1/4 cup peanut butter
  • 4 -5 cups powdered sugar
  • 3 tablespoons heavy cream
  • 1 teaspoon vanilla extract
  • 30 small peanut butter cup candies (10 whole, 10 cut in half, 10 cut in quarters)
  • 1 tablespoon chocolate sprinkles
  1. Preheat oven to 350°
  2. In the bowl of a mixer combine sugar and eggs and mix on medium speed to combine completely.
  3. Add in flour, baking powder and mix just until folded in.
  4. Then add in milk, butter, oil, peanut butter, and vanilla mix on low until it won't splatter, then increase speed to medium until everything is mixed well about one minute.
  5. Prepare a 13x9 baking pan with a baking spray like Baklene or use shortening and flour. (this will ensure the cake will release easily).
  6. Pour the batter into the pan and bake for 30-40 minutes or until a toothpick comes out clean.
  7. Cool the cake for 15 minutes, then turn out the cake onto a cooling rack to cool completely.
  8. Once the cake is cooled completely, slice the cake in half lengthwise so you'll have two even layers.
  9. *While the cake is baking prepare the fudge filling and frosting.
Fudge filling
  1. In a skillet heat the butter until melted then whisk in flour.
  2. Over medium heat slowly add in milk to create a sauce, then add in the sugar, cocoa, and salt.
  3. Next, mix in the chocolate chips and whisk them smooth.
  4. Allow this to cool before you spread it over the cake. If it's too warm it will run off the cake.
  5. Slather the fudge over the cake (use as much or as little as you'd like) Alternatively you can fill the cake with peanut butter frosting or chocolate frosting. (all are delicious for a filling on this cake).
peanut butter frosting
  1. In the bowl of a mixer whip room temperature butter, add peanut butter and mix.
  2. Then add powdered sugar, heavy cream and vanilla and beat until smooth and creamy.
  3. Spread frosting over cake.
  4. Place candy and sprinkles onto the cake.
Recipe by Created by Diane at