1 lb. ground beef, browned and drained
1 head lettuce, shredded
3 tomatoes, chopped
1 lg. onion, chopped
1 1/2 c. Cheddar cheese, shredded
1 lg. bag nacho cheese Doritos
1 (16 oz.) Catalina or taco flavor salad dressing

Combine all ingredients except Doritos and dressing in a large bowl. Mix well. Just before serving, add dressing and Doritos. Serve and eat immediately as salad gets soggy fast.