In small bowl, mix yogurt and flour; set aside. In same skillet; heat broth, thyme, paprika and onion to boiling; reduce heat. Simmer about 2 minutes, stirring occasionally, until onion is tender. Gradually stir yogurt mixture into broth mixture. Cook, stirring constantly, until thickened (do not boil). Stir chicken into sauce. Cook 1 minute longer. Serve chicken and sauce over noodles. Sprinkle with green onion.