Preheat oven to 375°F. Remove and reserve stems from mushrooms. Season mushroom caps with salt; set aside. Mince stems to yield 1/2 cup; discard remaining stems.
Combine Ground Beef, minced stems, blue cheese, bread crumbs, 3 tablespoons chives and steak seasoning. Spoon beef mixture evenly into mushrooms.
Place stuffed mushrooms on rack in broiler pan. Bake in 375°F oven 15 to 20 minutes. Sprinkle with additional chives, if desired.
Nutrition information per serving: 20 Calories; 9 kcal Calories from fat; 1 g Total Fat; 1 g Saturated Fat; 0 g Monounsaturated Fat; 5 mg Cholesterol; 49 mg Sodium; 1 g Total Carbohydrate; 0.1 g Dietary Fiber; 2 g Protein; 0.2 mg Iron; 0.8 mg Niacin; 0 mg Vitamin B6; 0.1 mcg Vitamin B12; 0.4 mg Zinc; 2.2 mcg Selenium; 5.9 mg Choline;