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Prepare filling: Preheat oven to 350. Melt 1/3 c butter in large saucepan over medium heat; add all-purpose flour, and cook, whisking constantly. 1 minutes. Gradually add chicken broth and milk, and cook, whisking constantly, 6 to 7 minutes or until thickened and bubbly. REmove from heat, and stir in Creole seasoning.