Combine seasoning ingredients in small bowl; press evenly onto beef steaks. Spray large nonstick skillet with nonstick cooking spray. Heat over medium heat until hot. Place steaks in skillet; cook 14 to 15 minutes for medium rare (145°F) doneness, turning occasionally. Do not overcook. Remove to plate; keep warm.
If necessary, re-spray skillet with cooking spray. Add mushrooms and 1/4 cup chives to skillet; cook 4 to 5 minutes or until mushrooms are tender, stirring occasionally. Remove from skillet; keep warm.
Meanwhile combine peppercorns, as desired, and mustard. Add mustard mixture, broth and cream to skillet; bring to a boil, stirring constantly. Cook and stir 2 to 3 minutes until thickened. Add mushroom mixture; cook until heated through.
Carve steaks into thin slices. Season with salt, as desired. Spoon sauce over steak. Garnish with chives, if desired.
Nutrition information per serving: 227 Calories; 108 kcal Calories from fat; 12 g Total Fat; 5 g Saturated Fat; 4 g Monounsaturated Fat; 96 mg Cholesterol; 292 mg Sodium; 4 g Total Carbohydrate; 1.4 g Dietary Fiber; 26 g Protein; 2.7 mg Iron; 6.5 mg NE Niacin; 0.4 mg Vitamin B6; 1.3 mcg Vitamin B12; 4.4 mg Zinc; 31.6 mcg Selenium;