1 egg
1 c. sugar
2 tbsp. flour
1/4 tsp. salt
1 c. sour cream
1 tsp. vanilla

CRUMB TOPPING:

1/3 c. brown sugar
1/3 c. flour
1/3 c. oatmeal
1/4 c. butter

Slice Granny Smith apples into 9" unbaked pie shell. Mix first 6 ingredients together, pour over apples in pie shell. Bake 45 minutes at 350 degrees. Remove from oven; mix crumb topping together, sprinkle over pie. Bake until pie is golden brown.