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Peanut Butter Sheet Cake

This peanut butter sheet cake is packed with as much peanut butter as possible for a truly phenomenal taste and texture!

Prep Time
20 mins
Cook Time
20 mins
Additional Time
1 hr
Total Time
1 hr 35 mins
Servings: 16 servings
Calories: 541 kcal
Course: Dessert
Cuisine: American

Ingredients

For the cake:
  • 1 1/2 cups granulated sugar
  • 1/2 cup brown sugar
  • 2 cups flour
  • 1 teaspoon baking soda
  • 1 teaspoon salt
  • 1 1/2 cups milk divided
  • 1 cup creamy peanut butter
  • 1 cup butter
  • 2 teaspoons vanilla
  • 2 large eggs
For the frosting:
  • 1 cup granulated sugar
  • 1/3 cup butter
  • 1/3 cup milk
  • 1/2 cup creamy peanut butter
  • 3/4 cup semi-sweet chocolate chips

Instructions

To make the cake:
    Cup of Yum
  1. Preheat oven to 400 degrees. Grease a rimmed half sheet pan.
  2. Add the sugars, flour, baking soda, and salt to a mixing bowl and whisk to combine.
  3. Add 1 cup of milk, peanut butter, and butter to a small sauce pan and bring to a boil, stirring often.
  4. Remove from heat and let set for 5 minutes to cool. Add to the dry ingredients.
  5. Add the remaining 1/2 cup of milk, vanilla, and eggs to the bowl and use an electric mixer to beat together on low speed until the batter is smooth and well combined.
  6. Spread cake batter into prepared baking sheet and bake for 15 minutes. Cool completely, about an hour.
To make the frosting:
  1. Add the sugar, butter, and milk to a small sauce pan and stir well. Bring to a boil and boil for exactly 60 seconds.
  2. Remove from the heat and stir in the peanut butter and chocolate chips until smooth and melted.
  3. Pour warm frosting over the cooled cake and spread with a spatula. Frosting will harden as it cools.
  4. Cut and serve once frosting has cooled and set.

Notes

  • Be sure to use a processed peanut butter, like Jif or Skippy, and not the natural kind that separates and has to be stored in the fridge.
  • Be sure to cool the peanut butter mixture a bit before mixing with the other ingredients so that you don't accidentally scramble the eggs with the hot mixture.
  • The frosting will seem a bit runny, but it will firm up as it cools. 
  • For a thicker layer of frosting, double the frosting recipe.
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Nutrition Information

Serving 1slice Calories 541kcal (27%) Carbohydrates 59g (20%) Protein 9g (18%) Fat 31g (48%) Saturated Fat 14g (70%) Cholesterol 67mg (22%) Sodium 483mg (20%) Potassium 263mg (8%) Fiber 2g (8%) Sugar 43g (86%) Vitamin A 550IU (11%) Calcium 62mg (6%) Iron 1.7mg (9%)

Nutrition Facts

Serving: 16servings

Amount Per Serving

Calories 541

% Daily Value*

Serving 1slice
Calories 541kcal 27%
Carbohydrates 59g 20%
Protein 9g 18%
Fat 31g 48%
Saturated Fat 14g 70%
Cholesterol 67mg 22%
Sodium 483mg 20%
Potassium 263mg 6%
Fiber 2g 8%
Sugar 43g 86%
Vitamin A 550IU 11%
Calcium 62mg 6%
Iron 1.7mg 9%

* Percent Daily Values are based on a 2,000 calorie diet.