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 for 2 minutes or until thickened. Reduce heat; add the soup, cheese and seasonings. Cook and stir for 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 the top. Bake, uncovered, at 350* for 30 minutes or until golden brown.