1 lb. ground beef
1 pkg. taco seasoning
1 head lettuce
2 tomatoes, cut up
1 med. onion, diced
8 oz. Mozzarella cheese, shredded
8 oz. Cheddar cheese, shredded
1 pkg. Doritos, crushed
Italian seasoning

Brown meat and drain. Add seasoning, mix well. Mix remaining ingredients together except dressing. Add dressing just before serving.