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["Begin any cheesecake recipe with all the ingredients at room temperature.", "This increases the volume.", "Crust: In a large bowl, combine graham crumbs, sugar, cinnamon and melted butter.", "Mix together until crumbs are moistened with butter; reserve 1/4 cup of this mixture for the topping later.", "Press crumbs into the bottom and sides of a spring pan.", "Wrap the spring pan with a sheet of heavy duty aluminum foil and set aside.", "Filling: Separate eggs; put yolks aside.", "Whip whites with 3 Tbsp.", "sugar until firm but not dry; set aside.", "In a food processor or with electric mixer, whip the cream cheese; add 1-1/2 cups sugar and 3 Tbsp. flour.", "Process until well combined about 2 minutes.", "Add egg yolks, one at a time, mixing continually between yolks.", "Add sour cream and flavoring.", "Process just another minute or two until all the ingredients are fully blended.", "Gently fold in egg whites; using a rubber spatular.", "Gently pour batter into spring pan and sprinkle the reserved 1/4 cup of gramham cracker crumbs on top.", "Place pan in a larger pan holding at least 1"" of water.", "Preheat oven to 325 degrees.", "Bake for 1 hour; then turn off the oven and continue to cook with door closed for another hour.", "Open oven door, leaving the cheesecake in the oven to cool down."]