Ranch Beef and Noodle Skillet

1 ounce ranch dressing mix
1 pound ground beef, cooked, drained
4 ounces sliced mushrooms, drained
8 ounces wide egg noodles, cook, drain
8 ounces sour cream
3/4 cup milk
1/2 cup grated Parmesan cheese

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

Garnish with sliced green onions.