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Potato and Gruyere gratin with caramelized onions.

Potato, Gruyère, and Caramelized Onion Gratin

Diana
Our potato, Gruyere, and caramelized onion gratin is the perfect side for any special occasion dinner. Add it to your menu!
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Servings 6 servings
Calories 649
Print Recipe Pin Recipe
Course Potatoes
Cuisine American
Prep Time 15 minutes
Cook Time 1 hour 20 minutes
Total Time 1 hour 35 minutes

Ingredients
  

  • 2 tablespoons unsalted butter
  • 1 1/2 tablespoons olive oil
  • 2 medium yellow onions, thinly sliced
  • Kosher salt and freshly ground black pepper
  • 1 1/2 cups heavy cream
  • 1 teaspoon garlic, minced
  • 1 teaspoon thyme, fresh chopped
  • 1 teaspoon rosemary, fresh chopped
  • 1 1/2 teaspoons sage, dried rubbed
  • 2 1/2 to 3 pounds russet potatoes, peeled and sliced about 1/3-inch thick
  • 2 cups Gruyere cheese, shredded
  • 1/2 cup grated Parmesan cheese

Instructions

Caramelize the Onions

  • Heat the butter and oil in a large skillet over medium heat. When the butter has melted, add the onions and a dash each of salt and pepper. Cook, stirring frequently, for 4 to 6 minutes or until the onions begin to brown in spots. Turn the heat to low, cover the skillet, and cook, stirring occasionally, for 15 minutes or until soft and golden brown. Add a splash of water or stock as needed.
    Caramelized onions for a potato and gruyere gratin recipe.

Prepare the Gratin

  • Heat the oven to 400°F and butter an 11-inch gratin dish or 2-quart casserole.
    Buttered gratin baking dish for a potato and gruyere gratin recipe.
  • Combine the cream, garlic, herbs, and a dash of each salt and pepper in a large saucepan, then place it over medium heat. Heat just until it starts to boil. Remove from the heat, taste, and add salt and pepper as needed. Add the sliced potatoes to the cream mixture.
    Layering a potato gratin with caramelized onions and Gruyere cheese.
  • Arrange about 1/3 of the potato slices in a slightly overlapping layer in the gratin dish. Sprinkle generously with salt and pepper. Top with half of the caramelized onions and 1/3 of the Gruyère. Repeat with another 1/3 of the potatoes, salt and pepper, the remaining caramelized onion, and another 1/3 of Gruyère. Finish with a layer of the remaining potatoes, salt, and pepper. Press the potatoes down and add the remaining cream mixture. Sprinkle with the remaining Gruyère and Parmesan.
    Potato gratin ready to bake with Gruyere cheese and Parmesan topping.
  • Cover the gratin dish with foil and bake for 45 minutes. Remove the foil and bake for 20 minutes or until the top is golden brown and the potatoes are fork-tender.
    Baked potato gratin with caramelized onions, Gruyere cheese, and Parmesan.
  • Remove the gratin to a rack and let it stand for 10 minutes before serving.  Enjoy!
    Potato and Gruyere gratin with caramelized onions.

Nutrition

Calories: 649kcalCarbohydrates: 41gProtein: 22gFat: 46gSaturated Fat: 26gPolyunsaturated Fat: 2gMonounsaturated Fat: 14gTrans Fat: 0.2gCholesterol: 133mgSodium: 488mgPotassium: 957mgFiber: 3gSugar: 5gVitamin A: 1500IUVitamin C: 15mgCalcium: 597mgIron: 2mg

Disclaimer:

Our nutritional information is based on a third-party application that analyzes the ingredients list to determine the values. The information is meant to be helpful, but should be considered an estimate. Values may differ depending on measurements, brands, serving variations, and database availability.

Keyword caramelized onions, gruyere cheese, potato gratin, scalloped potatoes
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