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Side view close-up of a Peanut Butter Sheet Cake with a rich glaze and marshmallows.
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Peanut Butter Sheet Cake

Prep Time 15 minutes
Cook Time 25 minutes
Total Time 40 minutes
Servings 12 slices
Calories 350
This delicious Peanut Butter Sheet Cake is moist, flavorful, and topped with a creamy glaze, making it a perfect dessert for any occasion.

Ingredients

Dry Ingredients

  • 2 cups all-purpose flour
  • 2 cups sugar
  • 1 teaspoon baking soda
  • 1/2 teaspoon salt

Wet Ingredients

  • 1 cup water
  • 3/4 cup butter, cubed
  • 1/2 cup chunky peanut butter
  • 1/4 cup canola oil
  • 2 large eggs, room temperature
  • 1/2 cup buttermilk
  • 1 teaspoon vanilla extract

Glaze

  • 2/3 cup sugar
  • 1/3 cup evaporated milk
  • 1 tablespoon butter
  • 1/3 cup chunky peanut butter
  • 1/3 cup miniature marshmallows
  • 1/2 teaspoon vanilla extract

Instructions 

  • Preheat oven to 350°F and grease a 15×10-inch baking pan.
  • Whisk flour, sugar, baking soda, and salt. Boil water and butter, then stir in peanut butter and oil. Combine with flour mixture.
  • Whisk eggs, buttermilk, and vanilla; add to flour mixture and mix gently.
  • Pour batter into prepared pan and bake for 20-25 minutes until a toothpick comes out clean.
  • For glaze, boil sugar, milk, and butter; stir in peanut butter, marshmallows, and vanilla. Spoon over warm cake.
  • Cool on a wire rack and allow the glaze to set.

Notes

Be careful not to overmix the batter to keep the cake light and fluffy.
Calories: 350kcal
Cost: $15
Course: Dessert
Cuisine: American
Keyword: Peanut Butter