- 1). Remove the frozen potatoes au gratin from the freezer. Leave moisture-resistant paper or foil on the top of the pan. Place the container in the refrigerator to partially thaw.
- 2). Remove the moisture-resistant paper from the top of the pan. If the potatoes look dry, pour a small amount of milk on top; depending upon the amount of potatoes, this can range from 1/4 to 1/2 cup.
- 3). Sprinkle shredded cheese on top of the potatoes. You can use the same variety used in the original recipe or another variety to add a different taste.
- 4). Cover the pan with aluminum foil and place in a preheated 400-degree oven. Bake until the internal temperature of the potatoes au gratin reaches 165 degrees.
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