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1 1/4 cups graham cracker crumbs
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1/4 cup unsalted butter, melted
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1 1/4 cups sugar
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4 eggs separated, at room temperature
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1 cup sour cream
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2 tablespoons all-purpose flour
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1 teaspoon vanilla extract
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2 packages (8 ounces each) cream cheese, softened
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24 to 32 walnuts halves
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