Add the sausage, mushrooms, onion, celery, salt, pepper, and poultry seasoning to a large skillet and saute until the sausage is no longer pink.
Spray a very large casserole dish with cooking spray and add the sausage mixture to the casserole dish.
Add 3/4 of the stuffing package and 3/4 of the container of chicken broth and stir and mix very well.
Continue to add both stuffing and broth, adding the cranberries, until you achieve the consistency you prefer. For me, it is the entire contents of both.
Bake in a preheated 350 degree oven for 30 minutes.