1 container (16 oz.) ready-to-spread vanilla frosting Decorations (see Tip)
LINE 13×9-inch pan with foil; spray lightly with cooking spray. Microwave butter in large microwaveable bowl on HIGH 45 sec. or until melted. Add marshmallows; toss to coat. Microwave 1-1/2 min. or until marshmallows are completely melted and mixture is well blended, stirring after 45 sec. ADD cereal; mix well. Press firmly and evenly into prepared pan. Cool 5 min.; cut into 16 bars. Remove from pan. Insert a wooden pop stick into one of the short ends of each bar; place on baking sheet. Cool until firm. SPREAD top of each pop with frosting. Add decorations as desired. Let stand until frosting is set. Wrap individually in plastic wrap; store at room temperature.