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Peanut Butter Sheet Cake Recipe
4.9 from 24 votes

Peanut Butter Sheet Cake Recipe

This Peanut Butter Sheet Cake is an unbelievably moist, rich, peanut butter cake with creamy peanut butter frosting poured on top. Similar to Texas Sheet Cake, but for the peanut butter lover instead!

Prep Time
15 mins
Cook Time
15 mins
Additional Time
15 mins
Total Time
45 mins
Servings: 20 servings
Calories: 366 kcal
Course: Cake
Cuisine: American

Ingredients

For the cake
  • ¼ cup peanut butter
  • 1 cup water
  • ½ cup butter unsalted
  • 1 cup granulated sugar
  • 1 cup light brown sugar packed
  • 2 cups all-purpose flour
  • 1 teaspoon kosher salt
  • 1 teaspoon baking soda
  • 2 egg large
  • ½ cup buttermilk
  • 1 teaspoon vanilla extract
For the frosting
  • ¾ cup butter unsalted
  • 6 Tablespoons buttermilk
  • ½ cup peanut butter
  • 3 ½ cups powdered sugar
  • 1 Tablespoon vanilla extract

Instructions

    Cup of Yum
  1. Preheat oven to 375 degrees F. Line a cookie sheet 12x18-inch (sheet pan size) with parchment paper. Set aside.
  2. In a LARGE saucepan, combine peanut butter, water, and butter for the cake. Bring to a boil, while stirring constantly. Once boiling, remove from heat. Add in sugars, flour, salt and baking soda. Mix until well combined. Add in eggs, buttermilk, and vanilla until blended. Pour into prepared baking sheet and bake for 15 minutes.
  3. While the cake is baking, prepare the frosting. In a saucepan, combine butter, buttermilk, and peanut butter. Bring to a boil, while stirring.
  4. Remove from heat and add in powdered sugar and vanilla extract. Whisk until smooth. Pour over warm cake.

Notes

  • Don't have buttermilk handy? You can make a buttermilk substitute to use in this recipe.
  • Unsalted butter is my preference here (and for most cakes and frostings). If you only have salted butter that will work, too, just reduce the amount of salt called for in the recipe.
  • Too much peanut butter? Use my favorite chocolate buttercream instead!
  • Love sheet cakes? Try our delicious Watergate Sheet Cake next!
  • Storage: Store at room temperature in airtight container or covered with plastic wrap for up to four days. Freeze for up to 3 months.

Nutrition Information

Serving 1slice Calories 366kcal (18%) Carbohydrates 51g (17%) Protein 5g (10%) Fat 17g (26%) Saturated Fat 8g (40%) Polyunsaturated Fat 7g (41%) Cholesterol 50mg (17%) Sodium 258mg (11%) Fiber 1g (4%) Sugar 39g (78%)

Nutrition Facts

Serving: 20 servings

Amount Per Serving

Calories 366

% Daily Value*

Serving 1slice
Calories 366kcal 18%
Carbohydrates 51g 17%
Protein 5g 10%
Fat 17g 26%
Saturated Fat 8g 40%
Polyunsaturated Fat 7g 41%
Cholesterol 50mg 17%
Sodium 258mg 11%
Fiber 1g 4%
Sugar 39g 78%

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