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Peanut Butter Sheet Cake

If you’re a peanut butter lover, this Peanut Butter Sheet Cake is your dream dessert. Combining the nutty richness of peanut butter with a melt-in-your-mouth texture, this cake is perfect for potlucks, celebrations, or whenever you’re craving something sweet and indulgent. And the best part? It’s incredibly easy to make!


Why You’ll Love This Cake

  • Rich Peanut Butter Flavor: From the moist cake to the creamy frosting, every bite is packed with peanut butter goodness.
  • Perfect for a Crowd: Whether you’re serving a party or bringing a treat to a gathering, this sheet cake delivers in size and flavor.
  • Quick and Simple: Made with pantry staples and ready in under an hour.

Ingredients You’ll Need

For the Cake:

  • ½ cup peanut butter
  • 1 cup water
  • 2 sticks butter
  • 2 cups flour
  • 2 cups sugar
  • 1 teaspoon salt
  • 1 teaspoon baking soda
  • 2 eggs
  • ½ cup buttermilk

For the Frosting:

  • 1 stick butter
  • ½ cup peanut butter
  • 6 tablespoons buttermilk
  • 1 teaspoon vanilla
  • 4 cups powdered sugar

How to Make Peanut Butter Sheet Cake

  1. Prepare the Cake Batter:
    • Preheat your oven to 350°F (175°C) and grease a sheet cake pan (or two 9×13-inch pans).
    • In a large bowl, combine flour, sugar, salt, and baking soda.
    • In a saucepan, mix peanut butter, water, and butter. Bring to a boil, then pour over the dry ingredients and stir well.
    • Add eggs and buttermilk, mixing until smooth.
  2. Bake the Cake:
    • Pour the batter into the prepared pan(s) and bake for 20-25 minutes. The cake is done when a toothpick inserted in the center comes out clean.
  3. Make the Frosting:
    • In a saucepan, bring butter, peanut butter, and buttermilk to a rapid boil. Remove from heat and stir in vanilla and powdered sugar until smooth.
  4. Frost the Cake:
    • Spread the warm frosting over the hot cake. Let the cake cool completely before slicing.

Tips for Success

  • Use Creamy Peanut Butter: For a smooth, luscious cake and frosting.
  • Buttermilk Substitute: If you don’t have buttermilk, mix ½ cup of milk with 1 teaspoon of vinegar or lemon juice and let it sit for 5 minutes.
  • Decorate: Add chopped peanuts, mini chocolate chips, or a drizzle of melted chocolate on top for extra flair.

Why It’s a Must-Try

Peanut Butter Sheet Cake is the ultimate comfort dessert. Its tender crumb, rich frosting, and bold peanut butter flavor make it an instant hit with both kids and adults. Whether you’re indulging in a slice for dessert or sneaking one for breakfast (no judgment!), this cake is sure to bring smiles all around.

Make it today and watch it disappear—one slice at a time! 🥜🎂

Peanut Butter Sheet Cake

This easy-to-make peanut butter sheet cake is a moist and fluffy treat, topped with a rich, creamy frosting that's perfect for any occasion.
Prep Time 15 minutes
Cook Time 25 minutes
Course Dessert
Cuisine American
Servings servings

Ingredients
 
 

  • ½ cup peanut butter
  • 1 cup water
  • 2 sticks butter
  • 2 cups flour
  • 2 cups sugar
  • 1 teaspoon salt
  • 1 teaspoon baking soda
  • 2 eggs
  • ½ cup buttermilk
  • Frosting:
  • 1 stick butter
  • ½ cup peanut butter
  • 6 tablespoons buttermilk
  • 1 teaspoon vanilla
  • 4 cups powdered sugar

Instructions
 

  • Preheat your oven to 350°F (175°C). Grease a sheet cake pan or two 9×13 inch pans and set aside.
  • In a mixing bowl, combine the flour, sugar, salt, and baking soda.
  • In a saucepan, mix together the peanut butter, water, and butter. Bring to a rapid boil and then pour over the flour mixture.
  • Stir the mixture together and then add the eggs and buttermilk, mixing until fully combined.
  • Pour the batter into the prepared pan(s) and bake for 20-25 minutes, or until a toothpick inserted into the center comes out clean.
  • For the frosting, bring the butter, peanut butter, and buttermilk to a rapid boil in a saucepan. Remove from heat and stir in the vanilla and powdered sugar.
  • While still hot, spread the frosting over the cake. Allow the cake to cool completely before cutting.

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