Cook ground beef and one cup onion in a skillet, stirring until beef crumbles and is no longer pink; drain well. Add salt and pepper.
Layer tortilla chips in a lightly greased 13"x9" baking dish; top with beans, beef mixture, green chilies and salsa. Sprinkle with cheeses. Cover and bake at 400 degrees for 8 to 10 minutes or until cheese melts. Top with guacamole, sour cream, olives and green onions. Serve with additional tortilla chips.