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