Preheat oven to 350°. Line a baking sheet with heavy-duty aluminum foil. Place shells on prepared baking sheet, and bake for 5 minutes. Cool completely on baking sheet. Reduce oven temperature to 300°.
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In a small bowl, combine cranberry sauce and orange zest. Cut Brie into about 45 pieces. Place 1 Brie piece in each pastry shell; top with about 1 teaspoon cranberry mixture.
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Bake for 4 to 6 minutes, or just until cheese begins to melt. Serve immediately.