Instructions: Preheat oven to 375F.
Place blueberries in crust; set aside.

Combine brown sugar, flour, vanilla, rind, and sour cream; spread over blueberries. Combine breadcrumbs, granulated sugar, and margarine; sprinkle over sour cream mixture. Bake at 375 for 40 minutes or until set and crumbs are lightly browned. Cool 1 hour on a wire rack.

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