This Sweet Potato & Cranberry Gratin is a festive and flavorful side dish perfect for holiday gatherings. Layers of tender boiled sweet potatoes and tart fresh cranberries are enriched with a cinnamon-spiced cream, then topped with nutty Gruyère cheese and crunchy breadcrumbs. Baked until golden and bubbly, this gratin offers a comforting blend of sweet, savory, and tangy flavors.