1. Preheat oven to 350 degrees F (175 degrees C). 2. Spray a 9X13X2 in pan with cooking spray and dust with flour. Set aside. 3. In a small bowl, stir together the cocoa, confectioners' sugar, butter and 2 tablespoons hot water until smooth and set aside. 4. In microwavable bowl, place peanut butter chips and shortening. 5. Microwave on high for 1 minute, or until chips are melted and smooth when stirred. 6. In large bowl, combine cake mix, brown sugar, 1-1/4 cups water, eggs and reserved melted peanut butter mixture; beat on low speed of electric mixer until moistened. Increase speed to medium, beat 2 minutes until smooth. Remove 1-1/2 cups of the batter and add it to the reserved cocoa mixture; blend well. 7. Pour the peanut butter flavored batter into the prepared pan. Drop spoonfuls of the chocolate batter on top. Swirl with a knife or spatula for a marbled effect. 8. Bake at 350 degree F (175 degrees C) for 40 to 45 minutes or until a wooden toothpick inserted in the center comes out clean. Cool and frost as desired. ---------------------------------------------------------------------------
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Ingredients