Combine sugar, sour cream, flour and salt stir well.
Place blueberries in unbaked pastry shell; sprinkle 1 tablespoon sugar over berries.
Spread sour cream mixture over berries.
Combine breadcrumbs, 1 tablespoon sugar, and butter; sprinkle over top. Bake at 375 degrees for 45 to 50 minutes or until center is firm.
Yield: one 9-inch pie.