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Press prepared graham cracker crust into bottom and up sides of baking pan.
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Mix cream cheese and sugar until well blended.
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Add egg yolks, one at a time, blending well after each addition.
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Beat egg whites and fold into cream cheese mixture.
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Pour over graham cracker crust.
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Bake at 350F for 30-40 minutes. Let settle for 15 minutes.
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TOPPING: Mix powdered sugar into sour cream, spread over baked cake and put back in oven for another 5 minutes at 350°F.
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Refrigerate overnite and serve.