Preheat oven to 375°F. Cook pasta according to package directions; drain well. In a large bowl combine the reserved chicken-vegetable mixture, the flour, and cooked pasta. Spread into a 3-quart rectangular baking dish. Cover with foil.
Bake 35 minutes. Sprinkle with cheese. Bake, uncovered, 15 to 20 minutes more or until heated through. Let stand 10 minutes before serving.