Preheat oven to 350 degree F (175 degrees C). Spread the white and whole wheat bread cubes in a single layer on a large baking sheet. Bake for 5 to 7 minutes in the preheated oven, or until evenly toasted. Transfer toasted bread cubes to a large bowl.
In a large skillet, cook the sausage and onions over medium heat, stirring and breaking up the lumps until evenly browned. Add the celery, sage, rosemary, and thyme; cook, stirring, for 2 minutes to blend flavors.
Pour sausage mixture over bread in a bowl. Mix in chopped apple, dried cranberries, parsley, and liver. Drizzle with turkey stock and melted butter, and mix lightly. Allow stuffing to cool completely before loosely stuffing a turkey.