New York Times

Sweet Potato and Gruyère Gratin

This rich, cheese-laden gratin is a more savory take on the usual Thanksgiving sweet potato casserole, with sage and rosemary giving it an herbal bite. If you'd like to make it partway ahead, you can peel and slice the potatoes the day before; store in a sealable plastic bag in the fridge. You can also simmer the cream mixture (don’t add eggs) and grate the cheese the day before as well, storing them covered in the refrigerator.