Miso Apple Butter Roast Chicken

Name: Miso Apple Butter Roast Chicken
Ingredients: 2 whole chickens; 16 ounces butter, softened at room temperature; 4 large red apples (any kind), peeled & diced into cubes; 3 large carrots, peeled & chopped; 5 - 6 stalks of celery, chopped; 1 large yellow onion, roughly chopped; 2 tablespoons whole grain mustard; 2 tablespoons apple butter; 2 tablespoon white miso; 4 cups chicken stock; 2 cups apple cider; 1 tablespoon garlic powder; 1 tablespoon onion powder; Fresh sage (as much as you want); Salt & pepper to taste; Rosemary & sage for stuffing the chicken; 2 cups pearl couscous; 1/4 cup fresh parsley, finely chopped