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 and chopped cookies; mix well. Press onto bottom of 9-inch square pan sprayed with cooking spray. Cool completely.
Cut into 18 bars. Insert lollipop stick into one short end of each. Dip ends in chocolate; top with sprinkles. Refrigerate 10 min. or until chocolate is firm.
