Preparation

• Line 13x9-inch pan with foil, with ends of foil extending over sides; spray with cooking spray.
• Chop 8 cookies. Microwave 1 Tbsp. butter in large microwaveable bowl on HIGH 45 sec. or until melted. Add 3 cups marshmallows; toss until evenly coated. Microwave 1 min. or until marshmallows are completely melted and mixture is well blended, stirring after 30 sec. Add cereal and chopped cookies; mix well. Press onto bottom of prepared pan.
• Chop remaining cookies finely. Microwave remaining butter in same large microwaveable bowl 45 sec. or until melted. Add remaining marshmallows; toss until evenly coated. Microwave 1 min. or until marshmallows are completely melted and mixture is well blended, stirring after 30 sec.; spread immediately over cereal mixture in pan. Top with finely chopped cookies; press gently into marshmallow layer to secure.
• Use foil handles to remove cereal mixture from pan. Roll cereal mixture up, starting at one long side. Cool completely. Cut roll-up into 14 slices to serve.