Preheat oven to 400°. In a bowl, sift together 2 tablespoons flour, 3/4 cup sugar, 3/4 teaspoon cinnamon, and salt. Stir in egg, vanilla, and sour cream. Fold in the apples, and spoon mixture into pie shell. Bake 15 minutes, then reduce oven temperature to 350°, and bake 30 minutes longer.
Meanwhile, combine the remaining flour, sugar, and cinnamon. With a pastry blender or fingertips, blend in the butter until mixture is crumbly. Increase the oven temperature to 400°. Sprinkle crumb mixture over the pie, and bake 10 minutes longer.
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