Combine first 4 ingredients; stir well. Place
blackberries 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 of pie is firm.
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