The Best Easy Boulanger Potatoes

"In French, these easy Boulanger potatoes (pomme boulanger) are an impressive potato side dish that requires very little effort and few (and cheap) ingredients. Boulanger potatoes are a sliced and layered roasted potato dish cooked in stock (broth). The dish consists of potatoes layered with sautéed onions and herbs (usually thyme) and originated in France. It's an easy potato recipe that was made by peasants and taken to their local bakery to be cooked because most people in rural France did not have their own ovens. Boulanger in French means bakery."