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–+ servings
Cheesy potato gratin in a black skillet, topped with golden-brown cheese, displayed on a woven mat.

Potatoes Au Gratin

Whether you’re looking for a dish to serve at family gatherings or a hearty addition to weeknight dinners, these creamy au gratin potatoes are guaranteed to be a hit. Let’s dive into what makes this dish so special and why it’s worth the extra time.
5 from 1 vote
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Prep Time 15 minutes
Cook Time 1 hour 25 minutes
Course Side Dish
Cuisine French
Servings 6
Calories 570 kcal

Ingredients
 
 

Cream Sauce

  • 1.5 cups heavy whipping cream
  • ½ cup milk
  • 2 tbsp unsalted butter
  • 3 garlic cloves minced
  • ¼ tsp salt
  • ¼ tsp black pepper
  • 2 sprigs thyme
  • 2 sprigs rosemary
  • 1 bay leaf

Potatoes

  • 1 cup Parmigiano Reggiano hand-grated
  • 2.5 lbs russet potatoes peeled and thinly sliced
  • 1 tsp salt
  • ¼ tsp pepper
  • 2 cups Gruyere cheese hand-grated

Instructions
 

Prepare the Cream Sauce

  • In a saucepan over medium heat, melt the unsalted butter and sauté the minced garlic until fragrant.
    Stirring garlic in a hot black pot on a stovetop with a wooden spoon, preparing for a savory recipe.
  • Add the heavy whipping cream, milk, thyme, rosemary, and bay leaf. Season with salt and black pepper.
    Creamy herb-infused milk in a pot on a stovetop, featuring thyme, rosemary, and bay leaf. Perfect for soups or sauces.
  • Let the mixture simmer gently for 5-7 minutes, allowing the herbs to infuse the cream. Remove from heat, discard the herbs, and set the sauce aside.
    Pot of milk boiling on a stovetop, creating steam, viewed from above.

Slice the Potatoes

  • Peel and thinly slice the russet potatoes into even rounds, about ⅛-inch thick, using a mandoline or sharp knife.
    Hand holding a thinly sliced potato above a glass bowl on a wooden counter, close-up.

Layer the Potatoes and Cream Sauce

  • Preheat your oven to 375°F. I made mine in a cast iron pan.
    Hand adjusting oven temperature dial to 160 degrees, focusing on precise cooking settings at home.
  • Arrange a layer of potato slices at the bottom of the pan or casserole dish, slightly overlapping.
    Pouring dosa batter onto a hot skillet for cooking, on a wooden table background.
  • Pour a small amount of the cream sauce over the potatoes, then sprinkle with 1/3 of the salt and pepper, and with 1/3 of the Gruyere cheese and Parmigiano Reggiano.
    Hands arranging sliced potatoes in a cast iron skillet with cream, preparing potato gratin on a wooden table.
  • Repeat the layering process but skip the cheese with the final layer. You'll add the final layer once the dish has cooked.
    Sliced potatoes being arranged in a cast iron skillet for a delicious gratin recipe.

Bake the Potatoes

  • Cover the baking dish with aluminum foil and bake for 1 hour 15 minutes.
    Woman in red sweater prepares food in cozy kitchen with poinsettia plants.
  • Remove the foil and top with the remaining cheese. Broil for 3 minutes or until nice and golden.
    Hand adding cheese to creamy potato gratin in a cast iron skillet on wooden surface.

Let Rest and Serve

  • Allow the dish to rest for 10 minutes before serving to ensure the layers set properly.
    Cheesy baked casserole in a skillet on a wooden table with floral oven mitts. Perfect comfort food recipe!
  • Serve warm with a slotted spoon to keep the layers intact.
    Delicious cheesy lasagna slice being served with a spatula from a cast iron skillet.

Video

Notes

These nutrition values are only estimates.

Nutrition

Serving: 1cupCalories: 570kcalCarbohydrates: 37gProtein: 19gFat: 40gSaturated Fat: 24gPolyunsaturated Fat: 2gMonounsaturated Fat: 11gTrans Fat: 0.2gCholesterol: 126mgSodium: 825mgPotassium: 892mgFiber: 3gSugar: 3gVitamin A: 1428IUVitamin C: 12mgCalcium: 515mgIron: 2mg
Keyword au gratin, potatoes, scalloped potatoes
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