1Cut beef into 4 serving pieces. Spray 12-inch skillet with cooking spray; heat over medium heat. Sprinkle both sides of beef with pepper. Cook beef in skillet 9 to 11 minutes for medium doneness (160°F), turning once. Remove beef from skillet; keep warm.
2In small bowl, mix remaining ingredients except chives until smooth; add to skillet. Heat to boiling. Boil 1 minute, stirring constantly. Stir in chives. Serve over beef.