HEAT oven 350°F. Spray 13 × 9-inch baking pan with no-stick cooking spray. COMBINE graham cracker crumbs and butter; mix well. Press crumb mixture firmly into bottom of prepared pan. Pour sweetened condensed milk evenly over crumb mixture. Layer evenly with remaining ingredients; press down firmly with fork. BAKE 25 to 30 minutes or until lightly browned. Loosen from sides of pan while still warm; cool on wire rack. Cut into bars or diamonds. For perfectly cut cookie bars, line entire pan with foil, extending foil over edge of pan. Coat lightly with no-stick cooking spray. After bars have baked and cooled, lift up by edges of foil to remove from pan. Cut into individual bars.