In order, on the bottom of a large bowl, place ½ c chopped onion, 2 large tomatoes (chopped), 18 oz cheddar cheese, 15 oz ranch style beans (drained), and 1 head lettuce (chopped). Do not mix.
Pour in ½ bottle Catalina dressing. Do not mix.
Place in the refrigerator and chill for at least 1 hour.
Add crushed Fritos to the top of the salad. Mix thoroughly and serve.