Preheat broiler. Cut each steak in half. Lightly sprinkle both sides of steaks with salt and pepper.
In a 12-inch skillet heat 1 tablespoon of the butter over medium-high heat. Add steaks; brown on both sides, cooking until steaks are near desired doneness, about 3 to 4 minutes per side. Transfer steaks to a broiler pan; spread tops of steaks with mustard.
Broil 3 to 4 inches from the heat for 2 to 3 minutes or until steaks have reached desired doneness.
Meanwhile, for herb butter, add remaining butter to skillet; cook over medium heat until butter begins to bubble and turn golden. Add half of the herbs; remove from heat.
Transfer steaks to plates; pour herb butter over steaks. Sprinkle with remaining herbs.