1Spray bottom and sides of 13x9-inch pan with cooking spray. In large microwavable bowl, microwave butter uncovered on High about 45 seconds or until melted.
2Add marshmallows; toss until coated. Microwave uncovered on High about 1 minute 30 seconds, stirring after 45 seconds, until mixture can be stirred smooth.
3Immediately add cereal and decors; stir until evenly coated. Press firmly into pan. Cool about 1 hour or until firm. Cut into 9 rounds using 3-inch round cutter. Decorate each to look like baby bib, using decorating icing. Store loosely covered.