Stove-Top Directions: Butter 13 x 9-inch pan. In 3-quart saucepan, melt butter over low heat. Add marshmallows; stir until marshmallows are melted and mixture is smooth. Remove from heat. Immediately stir in cereal until evenly coated. Using buttered back of spoon or hands, press mixture firmly in pan; cool. For bars, cut into 6 rows by 4 rows. Store loosely covered.