Combine beef and garlic in a bowl; chill 10 minutes. Place a large nonstick skillet coated with cooking spray over medium-high heat until hot. Add beef mixture, sauté 5 minutes or until beef is done. Remove beef from pan; keep warm. Combine bok choy and green onions in skillet; sauté for 2 minutes. Add remaining ingredients; simmer 3 minutes or until slightly thick.