Shop › 4 oz Gourmet Cookie - Cereal Killer Image 1 of 1 4 oz Gourmet Cookie - Cereal Killer $4.00 sold out A Sugar Cookie Base, with White Chocolate and Rainbow Sprinkles, stuffed with a Rice Krispie Treat. Sold Out Added! A Sugar Cookie Base, with White Chocolate and Rainbow Sprinkles, stuffed with a Rice Krispie Treat.