1. In medium bowl fold together marshmallow crème and frosting. Spread about 2 tablespoons on the bottoms of 10 of the KEEBLER CHIPS DELUXE Rainbow Chocolate Chip cookies.
2. Top with the remaining 10 cookies, bottom sides down, gently pressing together to make sandwiches. Individually wrap in plastic wrap. Place on baking sheet. Freeze about 2 hours or until firm. Store in freezer for up to 1 month.
*NOTE: If desired, substitute another 1/2 cup marshmallow crème for the canned frosting.