Heat oven to 350° F. In 2-quart casserole, place uncooked pasta; set aside. In large skillet, heat oil. Add carrot, celery, onion and parsley; cook until almost tender. Add broth, water, pepper, saffron and thyme; heat to boiling. Remove from heat; stir in chicken.
Pour chicken mixture over pasta; cover with crust, fluting edges. Vent crust for steam to escape; brush lightly with milk for even browning, if desired. Bake 25 to 30 minutes or until crust is golden brown.Servings: 4 to 6