Beef Stroganoff Casserole
["1 lb. ground beef", "1/2 c. chopped onion", "1 pkg. Hamburger Helper mix for beef noodle", "2 1/2 c. hot water", "1 c. dairy sour cream", "1 can (4 oz.) mushroom stems and pieces", "parsley flakes"]
["Heat oven to 450\u00b0.", "Cook and stir ground beef and onion in 10-inch skillet until beef is light brown and drain.", "Stir in noodles, sauce mix, water, sour cream and mushrooms (with liquid). Heat to boiling and pour into ungreased 2-quart casserole.", "Cover and bake 15 minutes.", "Sprinkle with parsley.", "Makes about 5 servings."]
["ground beef", "onion", "Hamburger", "water", "sour cream", "mushroom stems", "parsley flakes"]