Grease or line with parchment a 9x13 baking dish, set aside. Preheat oven to 350°.
Add flour, sugar, salt and cubed butter to mixing bowl, beat until combined & crumbly. Take 1 cup of mixture and set aside.
Take remaining mixture and firmly press into your baking dish, covering the bottom. Bake 15 minutes.
While crust is baking, whisk the eggs in a large bowl. Add sugar, sour cream, flour and salt. Whisk well. Gently fold in blueberries. Set aside.
When the crust is ready, remove from oven and add filling by gently spooning it over the top of the partially baked crust.
Sprinkle with remaining crust mixture you had set aside.
Bake 1 hour or until top is lightly browned.
If serving warm, add a scoop of vanilla ice cream on top.