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best au gratin potatoes in a casserole
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Au Gratin Potatoes

Our au gratin potatoes are rich, creamy, tender, and cheesy! The perfect comfort food to serve with almost anything. One of my most repeated recipe!
Course Side Dish
Cuisine American, French
Keyword au gratin, potato side dishes
Prep Time 25 minutes
Cook Time 1 hour
Total Time 1 hour 10 minutes
Servings 12 Servings
Calories 599kcal
Author Kathleen

Ingredients

  • 2 1/2 pounds Russet or Yukon gold potatoes
  • 1 garlic clove cut in half
  • 3 cups heavy cream
  • 1/4 teaspoon nutmeg freshly grated
  • 1 1/2 teaspoons salt
  • 1/2 teaspoon black pepper freshly cracked
  • 4-5 ounces Gruyere shredded

Instructions

  • Preheat oven to 350°F (177°C).
  • Rub the inside of a 2 1/2-- 3-quart baking dish with the cut side of the garlic (1).
  • Using a Mandoline or food processor, slice the 2 ½ pounds of potatoes 1/8 inch thick and place them in a large mixing bowl.
  • In a saucepan, heat the heavy cream (3 cups), nutmeg (1/4 teaspoon), salt (1 ½ teaspoons), and pepper (1/2 teaspoon) over medium heat until bubbles form around the edge. Pour warm cream over the potatoes and use a large spoon to mix well, use your hands to separate the potatoes to make sure all the slices are coated with the cream. Transfer the mixture to the prepared baking dish. Gently push down the potatoes and pour all of the cream from the mixing bowl over the potatoes. Evenly cover the top with the shredded Gruyere (4-5 ounces). Place the baking dish on a rimmed baking pan and bake in preheated oven for about 1 hour and 15 minutes or until the potatoes in the center of the baking dish are fork-tender and the top is brown.

Notes

  1. Mandoline: This recipe is a snap to make if you slice the potatoes with a mandoline or food processor. Both tools create thin, evenly sliced potatoes to help give this dish its signature texture.
  2. Heat Up The Cream 1st: In this dish, it’s important to heat up the cream in a saucepan on the cooktop before it’s added to the potatoes. Please don’t skip this step!
  3. Prep The Dish: Before you add the potatoes to the buttered baking dish, pour a thin layer of cream into the bottom of the baking dish. The bottom layer of potatoes will cook well and soak up the delicious goodness of the rich cream, like all the other layers.
  4. Mixing It Right: After warming the cream and adding the seasonings I mix the potatoes and cream together in a large bowl, mixing it all, with my well-washed hands, then separating the potato slices a bit with my fingers so they get coated more evenly with the cream mixture.
  5. To Layer Or Not: Some other recipes for Potatoes Au Gratin suggest layering the potatoes, cheese, and cream mixture, kind of like a lasagne. I think that process complicates this recipe unnecessarily. As long as you separate most of the potato slices, and get them coated with the cream mixture, there’s no need to layer the dish.
  6. Yes Please With The Cheese: This recipe also calls for all the cheese to be placed on top of the potatoes. This forms a perfectly delectable, lovely browned crust that is absolutely to die for! If the topping browns too quickly, loosely tent the top with aluminum foil.

Nutrition

Serving: 1/12 of the recipe | Calories: 599kcal | Carbohydrates: 27g | Protein: 12g | Fat: 50g | Saturated Fat: 31g | Cholesterol: 183mg | Sodium: 709mg | Potassium: 885mg | Fiber: 4g | Sugar: 0g | Vitamin A: 1930IU | Vitamin C: 22.4mg | Calcium: 325mg | Iron: 6.2mg