Guiltless Blueberry Cheesecake

½ cup reduced fat graham cracker crumbs

light butter, softened

-oz pkg reduced fat cream cheese, softened

¼ cup sugar (for cheesecake)

½ tsp vanilla extract, divided

-oz fat-free plain Greek yogurt

large egg whites

fresh lemon juice, divided

all purpose flour

½ cup fresh blueberries, divided

½ cup water

⅓ cup sugar (for blueberry sauce)

cornstarch, mixed with 2 Tbsp cold water