Puppy Chow 1/4 lb Butter 1 c Peanut butter 1 lb Box powdered sugar 1 lg Box Crispix cereal 12 oz Package milk chocolate chips Melt margarine, peanut butter and chocolate chips in a microwave on medium setting 2 minutes or longer until melted. Stir to blend. Place one large box of Crispix cereal in a large (very large) pan and pour chocolate mixture over top. Stir to coat. Place 1 lb box of powdered sugar in a grocery bag. Put coated cereal in the bag and shake until powdered sugar is absorbed. Open bag and let it cool. Store in tins.