1. Butter 13x9x2-inch pan.
2. Melt butter in large saucepan, over low heat. Add marshmallows; cook, stirring constantly, until marshmallows are melted. Remove from heat. Add peanut butter; stir until melted.
3. Add cereal; stir until well coated. Immediately press mixture evenly in prepared pan. Cool; cut into squares or triangles. Drizzle with CHOCOLATE DRIZZLE, if desired. About 24 pieces.
CHOCOLATE DRIZZLE; Place 1/2 cup HERSHEY'S Milk Chocolate Chips and 1 tablespoon shortening (do not use butter, margarine or oil) in small microwave-safe bowl. Microwave at MEDIUM (50%) 30 seconds or until chocolate is melted and mixture is smooth when stirred.