1. Preheat oven to 350 and grease 9×9 glass baking dish, set aside for  later
2. In a large bowl add flour, sugar, salt, and cubed butter, mix with electric mixer until the mix has a crumble consistency
3. Reserve 3/4 cup of mixture for topping
4. Press the remaining mixture in the bottom of glass baking pan
5. Bake for 15 minutes or until golden brown
6. Remove from oven and set aside

Filling:

1. Whisk eggs in large bowl add sugar, sour cream, flour and salt
2. When combined gently stir in fresh blueberries
3. Add the mixture evenly over the baked crust, then top with the reserved crumble
4. Bake for 50 minutes or until top is lightly browned
5. Cool for one hour prior to serving