Original Ranch Beef and Noodle Skillet

1 pkg. (1 oz) Hidden Valley Original Ranch dressing mix
1 lb. ground beef cooked and drained
1 jar sliced mushrooms (4.5 oz) drained
8 oz wide egg noodles, cooked and drained
8 oz. sour cream
3/4 c. milk
1/2 c. Parmesan cheese

In a saucepan, combine all ingredients except cheese. Heat thoroughly.
Sprinkle with Parmesan cheese