salsa, sour cream, guacamole, ripe olives for garnish if desired
Toss together onion, tomatoes, and lettuce in a large serving bowl. Set aside.
In a large skillet brown beef and drain grease. Add beans, salt, and chili powder. Simmer for about 10 minutes.
Just before serving mix salad dressing and cheese into greens. Pour beef mixture over the greens. Sprinkle with chips and garnish as desired (use salsa, guacamole, sour cream, and/or ripe olives to garnish).