Sausage, Apple and Cranberry Stuffing

INGREDIENTS: 1 1/2 cups cubed whole wheat bread 3 3/4 cups cubed white bread 1 pound ground turkey sausage 1 cup chopped onion 3/4 cup chopped celery 2 1/2 teaspoons dried sage 1 1/2 teaspoons dried rosemary 1/2 teaspoon dried thyme 1 Golden Delicious apple, cored and chopped 3/4 cup dried cranberries 1/3 cup minced fresh parsley 1 cooked turkey liver, finely chopped 3/4 cup turkey stock 4 tablespoons unsalted butter, melted