Preheat broiler. Spoon Worcestershire sauce over both sides of the steaks and let stand 5 minutes. Sprinkle garlic and pepper over steaks.
Place steaks on rack or broiler pan. Broil 3 to 4 inches from heat source 3 to 4 minutes per side for medium rare steak.
Remove pan from broiler. Sprinkle thyme, then cheese over steaks. Return to oven and broil 2 minutes, or until the cheese is golden brown.