Peanut Butter Sheet Cake with Peanut Butter Frosting

This Peanut Butter Sheet Cake is a rich, moist dessert topped with a creamy peanut butter frosting that melts in your mouth. Perfect for peanut butter lovers, this cake is simple to make and feeds a crowd—ideal for family gatherings, parties, or bake sales.

Why Make Peanut Butter Sheet Cake?

This recipe combines the deep, nutty flavor of peanut butter with a tender cake and a luscious frosting that’s hard to resist. The sheet cake format makes it easy to serve and share!

Ingredients

For the Cake:

  • 2 cups all-purpose flour
  • 1 1/2 cups sugar
  • 1 teaspoon baking soda
  • 1/2 teaspoon salt
  • 1 cup water
  • 1/2 cup unsalted butter
  • 1/2 cup creamy peanut butter
  • 1/2 cup whole milk
  • 2 large eggs
  • 1 teaspoon vanilla extract

For the Frosting:

  • 1/2 cup unsalted butter
  • 1/2 cup creamy peanut butter
  • 1/4 cup milk
  • 3 cups powdered sugar
  • 1 teaspoon vanilla extract
  • Pinch of salt

Equipment Needed

  • 9×13-inch sheet cake pan
  • Medium saucepan
  • Mixing bowls
  • Electric mixer or whisk
  • Spatula

Step-by-Step Instructions

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