Heat the oil in a very large skillet with sides at least 2 inches high. Add the sausage and onion and sauté over medium heat, stirring, until the onion is softened and the sausage begins to brown, about 6 minutes.
Add the sliced potatoes, sprinkle with the flour, thyme, and pepper and toss gently but thoroughly to combine well. Pour the broth, apple juice, and wine over the potato mixture and add the bay leaf.
Bring to a boil over high heat, reduce the heat to low, and cook, covered, until the potatoes are tender, 35 to 40 minutes.