Brown the ground beef and onions in a large skillet
In a large pot (or crockpot), mix the cooked ground beef, beans, corn, tomatoes, green chilies, taco seasoning, and ranch dressing. If desired, include the black and/or green olives.
Simmer on low heat for about 1 hour in the stove, or cook for about 6 hours on low in a crockpot.
Serve with corn chips, sour cream, grated cheese, and chopped green onions.