Cut cornbread into large chunks. Spread out on a baking tray. Allow the cornbread to dry out overnight. Alternately, bake the cornbread chunks at 250º for 30 minutes-1 hour to dry out faster.
Heat a large skillet over medium high heat, and add the chicken sausage. Cook the sausage to lightly brown it, breaking it up with a spatula as it cooks. Remove it from the skillet.
Into the frying pan, add butter, chopped onion, bell pepper and celery. Sauté over medium heat, stirring occasionally, for 15-20 minutes, until veggies are very tender.
Season with sea salt, black pepper, poultry seasoning, and add chopped sage and rosemary.
As the vegetables are cooking, add chicken stock 1/2 cup at a time, allowing it to reduce before adding more. Reserve about 1 cup of broth to pour over the cornbread.
Add the cornbread chunks to the vegetables, and return the sausage to the pan. Break up the cornbread with a spatula as it combines. Add more chicken stock or turkey drippings, if necessary, to soften the cornbread.
Add to a casserole dish. Bake at 400º F uncovered for 30 minutes.
Refer to notes if using to stuff a turkey.