Peanut Butter Sheet Cake

Indulge in this delightful peanut butter sheet cake, topped with fudge-like peanut butter frosting. With step-by-step instructions, Ineskohl Kitchen guides you through the entire process, ensuring a scrumptious result that’s sure to become a family favorite. Explore the recipe at Ineskohl Kitchen and bring the rich flavors of peanut butter and sweetness to your table today!

Peanut Butter Sheet Cake with Fudge-like Frosting


For the Cake:

  • 3/4 cup (170g) unsalted butter, cut into tablespoon-sized pieces
  • 1 cup (240ml) water
  • 1/4 cup (60ml) canola or vegetable oil
  • 1/2 cup (125g) creamy peanut butter
  • 2 cups (240g) all-purpose flour
  • 1 cup (200g) granulated sugar
  • 3/4 cup (165g) firmly packed light brown sugar
  • 3/4 teaspoon baking soda
  • 3/4 teaspoon table salt
  • 1/2 cup (120ml) buttermilk
  • 2 large eggs
  • 1 1/2 teaspoons vanilla extract

For the Frosting:

  • 10 tablespoons (142g) unsalted butter
  • 1/2 cup (120ml) buttermilk
  • 2/3 cup (160g) creamy peanut butter (avoid natural style)
  • 1/4 teaspoon salt (heaping)
  • 4 cups (480g) powdered sugar, sifted if desired
  • 1 teaspoon vanilla extract


  1. Preheat the Oven: Preheat your oven to 350°F (175°C). Lightly grease a 13×9-inch baking pan and set aside.
  2. Prepare the Wet Mixture: In a medium-sized saucepan, combine the butter, water, and oil. Heat over medium heat, stirring occasionally, until the butter is melted. Then, increase the heat to medium-high and bring to a boil. Remove from heat and stir in the peanut butter until smooth.
  3. Combine the Dry Ingredients: In a large bowl, whisk together the flour, granulated sugar, brown sugar, baking soda, and salt.
  4. Combine Wet and Dry Ingredients: Gradually stir the peanut butter mixture into the dry ingredients until well combined. Set aside to cool for 5-10 minutes.
  5. Prepare the Buttermilk Mixture: In a separate bowl, whisk together the buttermilk, eggs, and vanilla extract.
  6. Finalize the Cake Batter: Gradually stir the buttermilk mixture into the cooled peanut butter mixture, stirring until just combined to form a smooth batter.
  7. Pour into Pan and Bake: Pour the batter evenly into the prepared pan and transfer to the center rack of the preheated oven. Bake for 30-32 minutes or until a toothpick inserted into the center comes out clean or with moist crumbs.
  8. Prepare the Frosting: In a medium-sized saucepan, combine the butter, buttermilk, peanut butter, and salt. Cook over medium-low heat until the butter is melted, then increase to medium heat and bring to a boil, stirring constantly. Remove from heat and immediately add the powdered sugar and vanilla extract, whisking until smooth.
  9. Pour Frosting Over Cake: While still warm, pour the frosting evenly over the cake.
  10. Cool and Serve: Allow the frosting to set and the cake to cool before cutting into pieces. Serve and enjoy!

Leave a Reply

Your email address will not be published. Required fields are marked *

You cannot copy content of this page