Mexican Lasagna
["1 1/2 lb. hamburger (lean)", "3 small cans tomato sauce", "1/2 pt. small curd cottage cheese", "Monterey Jack or Colby cheese, grated", "1 pkg. taco seasoning mix", "1/2 pt. sour cream", "1 pkg. tortilla (corn) chips", "chopped onion (if desired)*"]
["*Omit if taco seasoning has lots of onion."]
["hamburger", "tomato sauce", "cottage cheese", "Colby cheese", "taco seasoning mix", "sour cream", "tortilla", "onion"]