Add cream cheese and sugar to the food processor. Mix until well combined and smooth.
Add flour and process until mixed in.
Add vanilla, lemon zest, lemon juice, and mix until fully combined.
Add egg and egg yolk. Pulse a few times until egg is fully incorporated, but don't over mix.
Pour mixture into a bowl and fold in the blueberries with a spatula (As an alternative, if you don't want to dirty a bowl, you can just put the berries on top, but I like them mixed in).
Pour mixture onto the cooled crust and spread to even it out.
Bake at 325° F for 35 minutes, or until the edges start to brown, and the mixture only slightly jiggles when shook.
Remove to a wire rack and cool completely. Then chill in the fridge for about 3 hours.
Cut into 9 squares and serve!