Rinse blueberries gently under cool water and drain.
Place blueberries in a large bowl and drizzle with lemon juice if using. Set aside.
In a small bowl combine next 3 ingredients (sugar, salt, flour).
Sprinkle flour mixture over blueberries. Use your hands to gently toss the blueberries to get them coated.Set aside.
Press the pie crust into a lightly greased deep dish pie plate.
Pour the blueberries onto the crust and spread in an even layer.
In a small bowl, stir together, brown sugar, oats, flour and cinnamon.
Cut in the butter with a fork and stir until mixture is crumbly.
Sprinkle crumb mixture evenly ontop of the blueberries.
Bake for 35-45 minute or until golden.
Let blueberry crumb pie rest for 10-15 minutes before cutting.
Enjoy
Notes
~TIPS~ I've never used frozen blueberries in this recipe so if you do, I can't promise you anything. Feel free to mix it up! Blueberries and raspberries go great together! Be careful when washing and mixing up the blueberries. They are very fragile.