Ghostly Graveyard Recipe

In a large saucepan, combine marshmallows and butter. Cook and stir over medium-low heat until melted and blended. Remove from the heat; stir in cereal. Press into a greased 13-in. x 9-in. dish; cool. Cut into 12 squares and set aside. Cut a 1/2-in. piece from the bottom of each sandwich cookie. Crush removed cookie pieces; set aside. Write "RIP" on each cookie, using white decorating gel. Position cereal squares on a large serving tray. With 2 tablespoons frosting, form a circle on each cereal square; top each with a decorated cookie. Sprinkle reserved crumbs around tombstones; add Halloween sprinkles.