1Heat broccoli mixture, mushrooms, onion, broth, marjoram, pepper and noodles to boiling in 10-inch skillet; reduce heat.
2Cover and simmer about 8 minutes, stirring occasionally, until noodles and vegetables are tender.
3Stir in chicken. Mix sour cream, water and flour; stir into chicken mixture. Heat to boiling. Boil and stir 1 minute.