INGREDIENTS
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1 1⁄4 cup graham crackers, finely crushed (1 sleeve)
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1 cup flour
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1 1⁄2 tsp baking powder
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1 stick (8 tablespoons) unsalted butter, softened
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1⁄2 cup brown sugar, packed
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1 egg, separated
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3 oz cream cheese, softened
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1⁄4 cup granulated sugar
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2 tsp lemon zest
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1⁄2 tsp vanilla extract