1. Combine first 3 ingredients in a small bowl. Refrigerate 20 minutes or until firm.
2. Sprinkle steaks evenly with salt and pepper. Heat a large grill pan over medium-high heat. Coat pan with cooking spray. Add steaks to pan; cook 4 minutes on each side or until desired degree of doneness. Remove steaks from pan; let stand 5 minutes. Divide butter mixture evenly among steaks.