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Close-up of freshly baked Au Gratin Potatoes with a golden, cheesy crust in a white casserole dish.

Au Gratin Potatoes (Classic)

This classic Au Gratin Potatoes recipe features creamy, cheesy layers of thinly sliced potatoes baked to perfection. It's a comforting and indulgent side dish perfect for family dinners and special occasions.
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Prep Time 15 minutes
Cook Time 1 hour 30 minutes
Resting Time 10 minutes
Total Time 1 hour 55 minutes
Servings: 4 servings
Course: Side Dish
Cuisine: American
Calories: 499
Ingredients Equipment Method Nutrition Notes

Ingredients
  

For the Potatoes
  • 4 medium russet potatoes thinly sliced
  • 1 medium onion sliced into rings
  • 1/2 teaspoon salt to taste
  • 1/4 teaspoon ground black pepper to taste
For the Sauce
  • 3 tablespoons butter
  • 3 tablespoons all-purpose flour
  • 1/2 teaspoon salt
  • 2 cups milk
  • 1 1/2 cups Cheddar cheese shredded

Equipment

  • 2-quart casserole dish
  • Medium saucepan
  • Whisk
  • Aluminum foil

Method
 

  1. Preheat your oven to 400 degrees F (200 degrees C). Grease a 2-quart casserole dish with butter.
  2. Layer half of the sliced potatoes in the bottom of the prepared casserole dish. Season with salt and pepper.
  3. Arrange the onion slices over the potatoes, then top with the remaining potato slices. Season again with salt and pepper.
  4. Melt the butter in a medium saucepan over medium heat. Whisk in the flour and salt. Cook, whisking constantly, for about 1 minute, until the raw flour flavor has cooked off.
  5. Cook, whisking constantly, until the sauce has thickened, about 3 to 5 minutes.
  6. Stir in the shredded Cheddar cheese all at once. Cook, stirring constantly, until the cheese is melted, about 30 to 60 seconds.
  7. Pour the cheese sauce evenly over the potatoes in the casserole dish. Cover the dish tightly with aluminum foil.
  8. Bake in the preheated oven for about 1 ½ hours, or until the potatoes are tender and the sauce is bubbly. Remove the foil for the last 15 minutes of baking if you prefer a crispier top.
  9. Let the gratin rest for about 10 minutes before serving.

Nutrition

Calories: 499kcalCarbohydrates: 49gProtein: 20gFat: 25g

Notes

This dish is a wonderful accompaniment to roasted meats, poultry, or even a hearty salad. For a richer flavor, you can substitute some of the milk with heavy cream.

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