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Yes, you can freeze au gratin potatoes. It’s best to freeze them in individual portions for easy reheating. Store these in air-tight containers, and make sure they’ve fully cooled before putting them in the freezer.
Large portions of au gratin potatoes can also be frozen. Reheating them in a low-temperature oven between 300-325° F for about 75 minutes yields the best results. Top the potatoes with some freshly shredded cheese during the last 5-10 minutes of reheating to achieve a golden, crispy crust again.