In a 10-inch nonstick skillet, cook ground beef over medium-high heat for 5-7 minutes, stirring occasionally, until thoroughly cooked; drain. Stir in taco seasoning mix, dressing and soup. Spoon evenly into ungreased 8-inch square glass baking dish.
Spread tomatoes and beans on top of beef mixture. Sprinkle cheese evenly over the top. Cut a 12x9 inch sheet of foil; spray with cooking spray. Cover dish with foil, sprayed side down.
Bake for 30 minutes. Uncover dish; bake 8-10 minutes longer or until edges are bubbly. Top with with chips, lettuce, green onions and olives before serving.