Preheat oven to 350 F. Lightly grease a 9x13-inch baking dish with non-stick cooking spray.
Brown the sausage in large skillet. Once browned, add onion, apples and celery and saute for 3 to 5 minutes.
In a large mixing bowl, toss the sausage-apple combo with the cornbread stuffing, thyme and sage, and then pour in the stock and toss well. Transfer to the prepared baking dish.
Bake in the preheated oven for 30 minutes, or until soft on the bottom and crispy on the top. Season with salt and pepper to taste.
Serve Sausage Apple Cornbread Stuffing as side dish.