Melt butter in large saucepan. Blend in flour. Gradually add chicken broth, stirring constantly, then add ... butter. Meanwhile cook Fettuccine (do not overcook), drain. Add ... casserole. Sprinkle with Parmesan. Heat in 350 degree ... 15 minutes. Serves 4-6.
Ingredients: 12 (broth .. cheese .. flour .. half .. mushrooms .. pieces ...)