1. In 3-quart sacuepan, combine margarine, milk and caramels. Cook over low heat, stirring frequently, until caramels are melted and mixture is smooth. Remove from heat.
2. Add KELLOGG'S CORN FLAKES cereal to caramel mixture. Stir until well-coated. With back of tablespoon, press mixture evenly and gently into 9 x 9 x 2-inch pan coated with cooking spray. Let cool at room temperature. Cut into bars when firm. Store in airtight container.