Immediately after removing brownie from oven, place KIT KAT® Bars over brownie surface. Spoon cheesecake mixture over bars; spread evenly. Return to oven; continue baking 35 to 40 minutes or until almost set. Remove from oven to wire rack. With knife, loosen cake from side of pan. Cool 2 hours. Cover; refrigerate 3 to 4 hours or until bars are thoroughly chilled. Cut into bars. Allow bars to soften slightly before serving. Cover; store leftover bars in refrigerator.