Preheat oven to 350°. Cook pasta according to package directions.
Meanwhile, in a saucepan, combine the flour and water until smooth. Gradually stir in broth. Bring to a boil; cook and stir 2 minutes or until thickened. Reduce heat; add soup, cheese and seasonings. Cook and stir 5 minutes or until cheese is melted.
Drain pasta; place in a bowl. Stir in soup mixture and chicken. Transfer to a greased 1-1/2 qt. baking dish. Toss bread crumbs and butter; sprinkle over top. Bake, uncovered, 30 minutes or until golden brown. Yield: 2-4 servings.