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Preheat oven to 325.
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Grease a 6 cup muffin pan (see note).
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In a medium bowl, mix together the graham cracker crumbs, sugar and butter with a fork until combined.
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measure a rounded tablespoon of the mixture into the bottom of each muffin cup, pushing it down firmly.
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bake in preheated oven for 5 minutes, then remove and cool.
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Beat together cream cheese, sugar, lemon juice, lemon zest and vanilla until fluffy.
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Mix in egg.
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Pour cream cheese mixture into muffin cups to about 3/4 full.
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Bake at 325 for 25 minutes.
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Cool completely in pan before removing. Refrigerate until ready to serve.