Sprinkle steaks with salt and pepper. Heat a large nonstick skillet over medium heat. Coat pan with cooking spray. Add steaks; cook 3 minutes on each side or until browned. Reduce heat to medium-low; cook 1 1/2 minutes on each side or until desired degree of doneness. Place steaks on a platter; keep warm.
Add the broth, wine, mustard, and Worcestershire sauce to pan; cook 30 seconds, stirring with a whisk to combine. Remove from heat; add capers and butter, stirring until butter melts. Serve over steaks.