1 7oz. bag Nacho Cheese Doritos, crushed
1 lb. Ground Beef, browned
1 pkg. taco seasoning, mixed according to directions
1 (8 oz.) pkg. shredded Cheddar cheese
1 (8 oz.) pkg. shredded Mozzarella cheese
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.