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