Cook noodles as directed on package .Melt butter and cook mushrooms in large skillet until lightly browned .Stir in flour and blend in with a forkor slotted spoon . Stir in milk and broth. stir until thickened. combine sauce, noodles ,and chicken . adjust seasonings to taste . Place in casserole dish . sprinkle top with parmesan cheese . bake @350 for 30 minutes .