In a large skillet, over medium-high heat, cook and crumble the beef (1 pound) and onion (1 cup) until it's cooked through and no longer pink. Drain off any excess fat.
Stir in taco seasoning (1 package), chili beans (1 can) with their liquid, and the Catalina Dressing (1 cup). Simmer on low for 10 minutes. I cool mine to room temperature before adding it to the salad.
In a large bowl, mix together the cooled meat and bean mixture and all the salad ingredients. Toss well.
Pour salad out onto a serving platter and lightly drizzle with Ranch Dressing and top generously with lightly crushed Doritos (2 bags).