Instructions

1. 1
   Preheat oven to 400°F (200°C).
2. 2
   In a mixing bowl, combine sour cream, flour, sugar, vanilla, and egg.
3. 3
   Beat until very smooth.
4. 4
   Fold in blueberries.
5. 5
   Pour filling into pie shell.
6. 6
   Bake for 25 minutes.
7. 7
   In a small bowl, mix flour, butter and pecans, stirring well.
8. 8
   Sprinkle over pie and bake an additional 10 minutes.
9. 9
   Remove from oven.
10. 10
    Cool on wire rack, then chill.