Classic Potato and Leek Gratin with Golden Parmesan Crust

Creamy potato and leek gratin baked with Parmesan breadcrumbs in a white ceramic baking dish

This creamy potato and leek gratin is the ultimate comfort food side dish. Made with tender sliced potatoes, buttery leeks, rich cream, and a crispy Parmesan breadcrumb topping, it’s perfect for holidays, Sunday dinners, or cozy family meals. Save this classic gratin recipe for Thanksgiving, Christmas, or anytime you need an easy make-ahead side dish.