Ingredients

  • 2 cups flour
  • 2 cups sugar
  • 1 teaspoon baking soda
  • 1/2 teaspoon salt
  • 1 cup butter (2 sticks or use 1 stick butter with 1/2 cup shortening)
  • 1 cup water
  • 1/3 cup cocoa powder
  • 3 eggs
  • 3/4 cup sour cream
  • 1/2 teaspoon vanilla
  • 3/4 cup creamy peanut butter
  • Chocolate Glaze
  • 1 (12 ounce) package semi-sweet chocolate chips (2 cups)
  • 2 tablespoons shortening

Method

  • Preheat oven to 350°F.
  • Grease and flour a 15 1/2"x10 1/2"x1" jelly roll pan.
  • In a large bowl, sift flour, sugar, baking soda, and salt.
  • In a small saucepan, mix water, butter, and cocoa.
  • Warm over medium heat, stirring occasionally, until mixture boils; boil and stir 1 minute.
  • Pour over flour mixture; beat just until blended (batter will be thin).
  • Add eggs, sour cream, and vanilla; beat until well blended.
  • Pour into jelly roll pan.
  • Bake until cake tester inserted in center comes out clean (25-30 minutes).
  • Spread peanut butter over warm cake.
  • Cool completely in pan on wire rack.
  • Microwave chocolate chips and shortening in a small microwave-safe bowl, on HIGH for 1 1/2 minutes; stir.
  • If needed, microwave for an additional 15 seconds at a time, stirring after each heating, just until chocolate is melted.
  • Carefully spread chocolate over top of peanut butter, covering it completely.
  • Allow topping to set; cut into squares.