Party Taco Salad

2 lbs. ground beef
2 pkgs. taco seasoning mix
16 oz. cheddar cheese, shredded
1 yellow onion, chopped
1 red onion, chopped
2 heads iceberg lettuce, chopped
4 tomatoes, chopped
2 avocados, chopped
2 green peppers, chopped
1 can sliced black olives
1 large bag Doritos, crumbled
1 (8oz.) bottle Catalina salad dressing

Brown ground beef with chopped yellow onion. Add 1 package of taco seasoning and water according to package directions. Drain any excess grease and set aside to cool completely. In a large bowl mix together chopped lettuce, tomato, cheese, avocado, red onion, peppers, olives and 2nd package of taco seasoning. Add cooled beef mixture. Just before serving, toss with the Catalina dressing and then mix in 3/4 of the package of crushed Doritos, leaving the rest on the side for people who want extra. (*The Doritos will get soggy if you add them in too early).
Enjoy!