Texas Peanut Butter Sheet Cake – Fisher Nuts

Ingredients

• 2 cups flour
• 1-3/4 cups granulated sugar
• 1/4 cup brown sugar
• 1 teaspoon baking soda
• 1 teaspoon instant coffee
• 1/2 teaspoon table salt
• 1 cup water
• 1/2 cup (1 stick) unsalted butter
• 1/2 cup vegetable oil
• 1/2 cup unsweetened cocoa powder
• 2 eggs
• 1/2 cup buttermilk
• 2 teaspoons vanilla
• 1/2 cup smooth peanut butter
• 2 tablespoons powdered sugar
• 2 tablespoons melted butter
• 2 cups Fisher® Walnut Halves & Pieces, toasted, divided
• 1/2 cup (1 stick) butter, softened
• 4 ounces unsweetened baking chocolate, melted, cooled
• 1/4 cup unsweetened cocoa powder
• 1 teaspoon vanilla
• 1/4 teaspoon table salt
• 4 cups powdered sugar, sifted