Prepare brownie mix according to package directions for 13 x 9-inch baking pan; cool. Using spoon, evenly drop marshmallow crème on cooled brownies. In small, microwave-safe bowl, microwave frosting on HIGH (100%) 30 seconds or until smooth. Repeat with SKIPPY®Creamy Peanut Butter. With spoon, drop frosting, then peanut butter over marshmallow crème. Gently swirl with knife to marble; cool completely in pan. To serve, cut into 24 bars.
This recipe is recommended for 24 servings.