Brown the meat and onion; drain. Add salt, chili powder and tomato sauce. Simmer 10 minutes. Butter a 9" X 13" casserole pan. Crush tortilla chips, place half of them on bottom of dish. Add meat sauce, then layer with sour cream, cottage cheese, chilies and olives. Top with cheddar cheese, then remaining chips. Bake at 350 degrees for 45 minutes.