Loosen cake from rim of pan; cool 10 minutes. Sprinkle with cinnamon sugar. Lightly score top of cheesecake with sharp knife. Cool completely before removing rim of pan. Spoon desired amount of whipped cream into pastry tube; pipe around edge of cheesecake. Sprinkle with orange zest, if desired. Decadent Cheesecakes from Cooking Class Magazine, March 1993.