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    The Creamiest Potatoes Au Gratin Recipe (Video)

    Published March 21, 2023. This post may contain affiliate links. Please read my disclosure policy.

    Learn how to make this delicious classic recipe for potatoes au gratin cooked with creamy gruyere cheese and breadcrumbs for the perfect get-together side dish.

    If you’re a potato side dish fan, then you are going to love my Roasted Garlic Mashed Potatoes or my Scalloped Potatoes Recipe.

    a spoon in a dish of potatoes au gratin


     

    Potatoes Au Gratin

    Potatoes au gratin is a fantastic classic French recipe that consists of layers of thinly sliced peeled potatoes, milk, salt, pepper, and breadcrumbs. Au gratin is a French word that literally translates to English as “to grate.” Obviously, this would most likely reference cheese, which would then be added to the potatoes and baked to form a crust on top.

    When au gratin is applied to cooking, it means finished or sprinkled with breadcrumbs or grated cheese, or both, and then it is browned in the oven. In this instance, potatoes au gratin would have a layer of breadcrumbs and cheese on top that are then browned.

    If you see an au gratin potatoes recipe online that does not have breadcrumbs on top. Then it is most likely not an accurate representation of potatoes au gratin.

    Ingredients You’ll Need

    The traditional ingredients for a potatoes au gratin recipe are potatoes, milk, butter, flour, salt, pepper, breadcrumbs, and cheese. Here is my take on each of these ingredients.

    • Milk/Cream – I believe heavy whipping cream provides full-fat, full-flavor options for potatoes au gratin and is the best ingredient. If using milk, you need to go through the process of making a roux and thickening the milk a bit to make a bechamel sauce before adding in the gruyere cheese to make a mornay sauce and mixing it with the sliced potatoes.
    • Cheese – There are a few options you can use when using cheese.  For cheaper alternative cheeses, try using Swiss cheese, Parmesan cheese, or even Mozzarella cheese.  For more expensive full-flavored cheeses, use Gruyere or Comté.
    • BreadcrumbsBreadcrumbs are incredibly traditional in potatoes au gratin, and you can use panko breadcrumbs, or any simple breadcrumb will do.
    • Potatoes – Use russet potatoes for this recipe.

    How to Make Potatoes Au Gratin

    Peel and slice russet potatoes until they are between 1/8” and ¼” thick.  You can also feel free to use Yukon potatoes as well. I like to use a mandolin but feel free to use a sharp chef’s knife.

    slicing potatoes

    Mix the sliced potatoes in a large bowl with the cream, shredded gruyere cheese, finely minced garlic, salt, white pepper, and nutmeg until thoroughly combined. Mix everything in a bowl to ensure the potatoes are seasoned and coated by tasting some of the cream after it is mixed in.

    mixing potatoes, cream, and cheese

    Transfer the potato mixture to a deep 13×9 casserole dish sprayed with non-stick spray and even it out to make it flat.

    pouring cream on sliced potatoes in a pan

    Cover in foil and bake it in the oven for 90 minutes at 400°.

    adding foil to a pan

    Remove the pan from the oven and take the foil off and discard it.

    removing foil from a pan

    Evenly sprinkle on breadcrumbs and parmesan cheese over top, completely covering the cooked potatoes.

    sprinkling cheese on breadcrumbs

    Drizzle on melted butter to help slightly brown the breadcrumb and cheese topping.

    adding butter to breadcrumbs

    Bake in the oven for 20 to 25 minutes or until golden brown.  The outside edges of the pan should be bubbling. Let the potatoes au gratin cool at room temperature for 5-10 minutes before serving.

    scooping out potatoes au gratin

    Can I Make Them the Night Before?

    You can absolutely make au gratin potatoes the night before serving them.

    • Assemble everything and then bake them in the oven for 60 minutes.
    • Remove the au gratin potatoes from the oven and immediately top off with breadcrumbs, cheese, and melted butter.
    • Cool the au gratin potatoes in the refrigerator overnight until about 30 minutes before you are ready to serve them.
    • Take the potatoes out of the refrigerator and let them stand at room temperature for about one hour before placing the pan back in the oven uncovered at 375° for 45-50 minutes or until hot in the center and cooked throughout.

    Make-Ahead and Storage.

    Make-Ahead: These are best eaten right away. However, you can make them 1 day ahead of time by following my instructions above.

    How to Store: I like to store these in the refrigerator covered in plastic for up to 4 days.  I also cover and freeze them for up to 2 months.  Simply thaw them for 1 day in the refrigerator before reheating them.

    How to Reheat: To reheat them, add your desired portion to a pan, cover with foil, and bake in the oven at 375° for 20-25 minutes or until hot. In addition, you can simply add them to the microwave and heat them until hot.

    Chef Billy Parisi

    CHEF NOTES + TIPS

    • Feel free to use Yukon Gold or Red Bliss potatoes for this recipe.
    • You can substitute half and half for the heavy cream.
    • These potatoes au gratin are meant to feed many people, so feel free to cut the recipe in half.
    • If you do not have a deep 13×9 casserole dish, please use two standard-size 13×9 dishes.

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    Video

    Potatoes Au Gratin Recipe

    5 from 31 votes
    Make this delicious classic recipe for potatoes au gratin that is cooked with gruyere cheese & breadcrumbs for the perfect side dish.
    Servings: 20
    Prep Time: 20 minutes
    Cook Time: 1 hour 55 minutes

    Ingredients 

    • 5 pounds peeled and thinly sliced russet potatoes, ¼” to 1/8” thick
    • 1- quart heavy whipping cream
    • 4-6 finely minced cloves of garlic
    • 1- pound shredded gruyere cheese
    • 1 cup breadcrumbs
    • 1/4 cup grated parmesan cheese
    • 1 stick melted unsalted butter
    • ½ teaspoon ground nutmeg
    • coarse sea salt and white pepper to taste

    Instructions

    • Preheat the oven to 400°.
    • Combine the sliced potatoes, cream, garlic, gruyere cheese, nutmeg, salt, and pepper in a large bowl until thoroughly mixed. Ensure the potatoes are seasoned and coated by tasting some of the cream after mixing it.
    • transfer the mixture to a deep 13×9 casserole pan sprayed with non-stick spray and flatten out with a spoon to make it level.
    • Cover in foil and bake in the oven at 400° for 80 to 90 minutes.
    • Remove the foil and evenly sprinkle on the breadcrumbs and cheese, completely coating the sliced potatoes.
    • Drizzle on the melted butter and place back in the oven for 20 to 25 minutes or until golden brown on top and cooked throughout.
    • Let cool at room temperature for 5-10 minutes before serving.

    Notes

    Make-Ahead: These are best eaten right away. However, you can make them 1 day ahead of time by following my instructions above.
    How to Store: I like to store these in the refrigerator covered in plastic for up to 4 days.  I also cover and freeze them for up to 2 months.  Simply thaw them for 1 day in the refrigerator before reheating them.
    How to Reheat: To reheat them, add your desired portion to a pan, cover with foil, and bake in the oven at 375° for 20-25 minutes or until hot. In addition, you can simply add them to the microwave and heat them until hot.
    You can also feel free to use Yukon potatoes as well.
    When it’s done cooking in the oven, The outside edges of the pan should be bubbling.
    You can substitute half and half for the heavy cream.
    These potatoes au gratin are meant to feed many people, so feel free to cut the recipe in half.
    If you do not have a deep 13×9 casserole dish, please use two standard-size 13×9 dishes.
     

    Nutrition

    Calories: 375kcalCarbohydrates: 26gProtein: 11gFat: 26gSaturated Fat: 16gCholesterol: 91mgSodium: 159mgPotassium: 540mgFiber: 2gSugar: 1gVitamin A: 921IUVitamin C: 7mgCalcium: 300mgIron: 1mg
    Course: Side Dish
    Cuisine: American, French