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5 from 5 votes
Overhead picture of Peanut Butter Texas Sheet Cake on a blue gingham napkin
Peanut Butter Texas Sheet Cake
Prep Time
20 mins
Cook Time
20 mins
Total Time
40 mins
This delicious Peanut Butter Texas Sheet Cake is one of our favorite desserts EVER! It's also one of the quickest and easiest cakes you'll ever make!
Course: Dessert
Cuisine: American
Keyword: Peanut Butter Texas Sheet Cake, Ridiculously Easy
Servings: 24
Calories: 348 kcal
Author: Chris Scheuer
For the cake:
  • 1 cup water
  • 1 cup butter 2 sticks
  • ½ cup peanut butter
  • 2 cups sugar
  • 1 teaspoon vanilla extract
  • 2 large eggs
  • 1 teaspoon baking soda
  • ¼ teaspoon salt
  • 2 cups all-purpose flour
  • ½ cup buttermilk
For the icing:
  • ½ cup butter 1 stick
  • ¼ cup creamy peanut butter
  • ½ cup dark brown sugar
  • 4-6 tablespoon buttermilk (or half and half or milk)
  • 1 teaspoon vanilla extract
  • 3½-4 cups powdered sugar
For the cake:
  1. Preheat the oven to 350˚F. Generously spray a 12x18-inch sheet pan with baking spray OR rub with shortening then add a tablespoon of flour and tilt the pan in all directions to coat the shortening with flour.

  2. Combine water, butter and peanut butter in a medium-large, microwave-safe bowl. Cook on high power for 2-2½ minutes or until the butter is melted. Add the sugar and vanilla, then whisk until well combined. Set aside for 5 minutes to cool.
  3. Add the eggs and whisk until smooth then add the baking soda and salt. Whisk until well combined.
  4. Add the flour, whisking vigorously until lump-free then add the buttermilk and stir until well combined.
  5. Pour the batter into the prepared pan and smooth to an even layer. Bake for 20-25 minutes, until a toothpick inserted in the center, comes out clean and the top feels firm and springs back lightly when touched.
  6. Cool for 20 minutes then top with the icing. Spread the icing with a knife to cover the surface. If desired, swirl the icing with the back of a small spoon for a pretty presentation. Serve warm or at room temperature.
For the icing:
  1. Combine the butter, dark brown sugar and peanut butter in a medium-large microwave-safe bowl. Cook on high power for 1 minute. Whisk well then return to the microwave for another minute.
  2. Add 4 tablespoons of the buttermilk (or half and half or milk) and whisk well to combine. Add 3½ cups of powdered sugar and whisk until smooth. You’re looking for a fairly thick but still pourable icing. If too thick, add a bit more buttermilk. If too thin, add a little more powdered sugar and stir again until nice and smooth.
Recipe Notes

See Café Tips above for more detailed instructions and tips.

Cake recipe adapted from My Recipes, icing, a Café concoction.

Nutrition Facts
Peanut Butter Texas Sheet Cake
Amount Per Serving
Calories 348 Calories from Fat 144
% Daily Value*
Fat 16g25%
Saturated Fat 8g50%
Cholesterol 45mg15%
Sodium 224mg10%
Potassium 87mg2%
Carbohydrates 49g16%
Fiber 1g4%
Sugar 39g43%
Protein 4g8%
Vitamin A 387IU8%
Calcium 23mg2%
Iron 1mg6%
* Percent Daily Values are based on a 2000 calorie diet.