How to Make It
Preheat oven to 375°.
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.