01 - Preheat your oven to 350°F.
02 - Heat 1 tablespoon of olive oil or butter in a large ovenproof pot or Dutch oven over medium heat. Add the chicken sausage pieces and brown them for 3–4 minutes. Remove the browned sausage and set aside.
03 - Add the remaining oil or butter to the pot. Sauté the sliced onions, carrots, and celery for 5–6 minutes until they are softened and just beginning to caramelize.
04 - Layer half of the sliced potatoes over the sautéed vegetables. Season lightly with salt and pepper, then sprinkle with half of the dried thyme. Evenly distribute half of the browned sausage over this layer.
05 - Repeat the layering process with the remaining potatoes, thyme, and sausage.
06 - Pour in the chicken stock and hard apple cider. Add the bay leaves. Bring the mixture to a gentle simmer on the stovetop.
07 - Cover the pot and carefully transfer it to the preheated oven. Bake for 1 hour, or until the potatoes are tender and the flavors have melded together beautifully.
08 - Before serving, remove and discard the bay leaves. Garnish generously with fresh parsley.