Taco Casserole
["1 lb. hamburger", "1 onion", "28 oz. can tomatoes", "1 pkg. taco seasoning", "1/2 pt. sour cream", "1/2 lb. Mozzarella cheese, shredded", "1/2 lb. Cheddar cheese, shredded", "nacho chips"]
["Put crushed chips on bottom of 10-inch pan.", "Brown hamburger and onion; add seasoning and tomatoes.", "Pour on top of chips. Spread sour cream; top with cheeses.", "Bake at 350\u00b0 for 30 minutes."]
["hamburger", "onion", "tomatoes", "taco seasoning", "sour cream", "Mozzarella cheese", "Cheddar cheese", "nacho chips"]