Blueberry Pie with Crumble Crust

Pie:

4.5- 5 C of blueberries
3/4 - 1 C of sugar
2 T flour
1 T lemon juice
1/4 t cinnamon

Mix flour, sugar and cinnamon together.  Pour over blueberries and stir gently so berries are covered.  Pour into prepared (but unbaked) pie crust.  Sprinkle with lemon juice.

Crumble Crust:

2/3 C packed brown sugar
1/2 C all purpose flour
1/2 t cinnamon
3/4 C rolled oats
6 T butter softened

Mix all dry ingredients together.  Cut in butter (you may have to use your hands).  Sprinkle on prepared pie and bake at 400 F for 45 minutes or until crumble crust is starting to brown.