In a pan brown ground beef along with yellow onions. Add in one package of taco seasoning mix and water as directed on the seasoning package. Set aside.
In a large bowl mix together tomatoes, lettuce, avocados, cheddar cheese, red onion, olives, and the other package of taco seasoning mix. Add beef mixture and toss until well combined.
Right before serving – Toss with Catalina salad dressing and add chips.