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Amazing 60-Minute Potatoes Au Gratin Secret

potatoes au gratin

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Achieve that ultimate, restaurant-quality Potatoes Au Gratin. This recipe delivers incredibly creamy layers of thinly sliced potatoes baked in a rich garlic and Gruyere sauce, topped with a perfectly golden, crisp crust. It is the comforting side dish you have been planning to master.

Ingredients

Scale
  • 3 pounds Russet potatoes, peeled and thinly sliced
  • 4 tablespoons unsalted butter
  • 2 cloves garlic, minced
  • 1/4 cup all-purpose flour
  • 2 cups whole milk
  • 1 cup heavy cream
  • 1 teaspoon salt
  • 1/2 teaspoon black pepper
  • 1/4 teaspoon nutmeg
  • 1 cup grated Gruyere cheese
  • 1/2 cup grated Parmesan cheese

Instructions

  1. Preheat your oven to 375°F (190°C). Lightly grease a 9×13-inch baking dish.
  2. Peel and slice potatoes very thinly, about 1/8 inch thick. Set aside.
  3. In a medium saucepan, melt the butter over medium heat. Add the minced garlic and cook for 1 minute until fragrant. Do not brown.
  4. Whisk in the flour to create a roux. Cook, stirring constantly, for 1 minute.
  5. Gradually whisk in the milk and heavy cream until the mixture is smooth.
  6. Bring the sauce to a gentle simmer, stirring until it thickens slightly.
  7. Remove from heat. Stir in the salt, pepper, and nutmeg.
  8. Stir in half of the Gruyere cheese and half of the Parmesan cheese until melted and smooth.
  9. Arrange one-third of the sliced potatoes in an even layer in the prepared baking dish.
  10. Pour one-third of the cheese sauce evenly over the potatoes.
  11. Repeat the layering process two more times: potatoes, then sauce.
  12. Sprinkle the remaining Gruyere and Parmesan cheese over the top layer.
  13. Bake for 60 to 75 minutes, or until the potatoes are tender when pierced with a fork and the top is golden brown and bubbly.
  14. Let the gratin rest for 10 minutes before slicing and serving.

Notes

  • For the best texture, slice potatoes uniformly using a mandoline slicer.
  • Use high-quality, freshly grated cheese for superior melting and flavor.
  • If the top browns too quickly during baking, loosely cover the dish with aluminum foil for the last 15 minutes.

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