Chicken Mushroom Noodle Soup

Name: Chicken Mushroom Noodle Soup
Ingredients: 1 4-5 pound chicken, cut into drums, wings, thighs and breasts (halved); 10 peppercorns; 2 whole allspice berries; 2 bay leaves; 8 cups low-sodium chicken broth; 1 medium onion, chopped; 4 medium carrots, sliced into 1/2 thick pieces; 3 stalks celery, sliced into 1/2 thick pieces; 1 tablespoon butter; 8 ounces crimini or button mushrooms, stemmed and sliced; 8 ounces egg noodles, cooked to al dente; salt and pepper to taste; fresh parsley for garnish