Taco Casserole

1 7oz. bag nacho cheese doritos, crushed
1 lb. hamburger, browned
1 pkg. taco seasoning,
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 minutes.