In a large skillet, saute the mushrooms in butter until tender. Remove mushrooms with a slotted spoon and keep warm; set aside
Sprinkle chicken with salad dressing mix. In the same skillet, brown chicken on both sides. Transfer to a 13x9 baking dish coated with non stick spray. Stir the soup, cream cheese, wine, milk, 1/2 cup chicken stock and reserved mushrooms into skillet; heat through. Spoon mixture over the chicken.
Cover and bake at 350 for 25-30 minutes or until a meat thermometer reads 170°.
Meanwhile, cook noodles according to package directions; drain. Serve with chicken and sauce; sprinkle with chives.