Heat large nonstick skillet over medium heat until hot. Add Ground Beef; cook 8 to 10 minutes, breaking into 3/4-inch crumbles and stirring occasionally. Pour off drippings. Stir in salsa; cook 2 minutes. Remove skillet from heat; keep warm.
Line 4 plates with salad greens. Divide beef mixture among 4 plates. Top beef with cheese, tomato, pepper and onion. Garnish with olives and dressing, as desired.