Creamy Mushroom Barley Soup

Ingredients (12)

• 1 quart chicken stock, divided
• SUB: Veg Stock for vegetarian version
• 1/2 cup pearl barley
• 2 tablespoons butter
• 1 pound cremini mushrooms, sliced
• 1 small white onion, diced
• 2 stalks celery, sliced
• 1 carrot, peeled and sliced
• 2 tablespoons all-purpose flour
• 1/2 cup sour cream
• Salt and pepper, to taste
• Chives, garnish