Taco Casserole

1 7oz. bag Nacho Cheese Doritos, crushed 1 lb. hamburger, browned 1 pkg. taco seasoning, mixed according to directions 1 (8 oz.) pkg. shredded Cheddar cheese 1 (8 oz.) pkg. shredded Mozzarella cheese Shredded Lettuce Sliced tomato Layer ingredients in 9 x 13 pan as listed - crushed chips, meat and seasonings, 2/3 of cheese, lettuce, tomato, and remaining cheese. Bake at 350 degrees for 15 minute