Au gratin recipes are baked or broiled in order to brown a cheese or bread crumb topping. The bread crumb topping for this recipe is browned in a skillet, so this dish is prepared completely on the stovetop.
An au gratin dish is a shallow casserole dish. The broad surface allows for more of the crumb topping.
Try this rich chicken casserole with crisp breadsticks and steamed green beans.