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Crispy Parmesan and Gruyere Potato Gratin

Crispy Parmesan and Gruyere Potato Gratin

Indulge in layers of thinly sliced potatoes baked in a creamy garlic sauce, topped with crispy Gruyere and Parmesan cheese. A decadent, crowd-pleasing side dish that’s easier than it looks—potato and cheese lovers, unite!
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Course: Side Dish
Cuisine: American
Prep Time: 20 minutes
Cook Time: 1 hour 20 minutes
Total Time: 1 hour 40 minutes
Servings: 6

Ingredients
  

  • 1½ cups heavy cream
  • 2 tsp kosher salt
  • 3 cloves garlic minced
  • 2 tbsp unsalted butter
  • 2 small shallots finely diced
  • 5 medium potatoes red, Yukon gold, or white; skins on
  • 1 cup grated Gruyère cheese
  • ½ cup grated Parmesan cheese
  • 1 tsp fresh thyme or chives finely chopped

Instructions

  • Preheat Oven: Preheat the oven to 325°F (165°C).
  • Prepare Potatoes: Wash and thoroughly dry the potatoes, leaving the skins intact. Slice them into uniform ⅛-inch rounds using a sharp knife or mandolin. Set aside.
  • Infuse Cream Mixture: In a small saucepan over low heat, combine the heavy cream, salt, and minced garlic. Simmer gently for 5 minutes, stirring occasionally. Remove from heat and set aside.
  • Caramelize Shallots: Melt the butter in a 12-inch cast iron skillet over low heat. Add the diced shallots and cook, stirring frequently, until softened and lightly caramelized (5–7 minutes). Remove from heat.
  • Layer Potatoes: Arrange the potato slices in a tight, overlapping spiral pattern over the caramelized shallots, beginning at the outer edge of the skillet and working inward.
  • Assemble and Bake: Pour the infused cream mixture evenly over the potatoes. Cover the skillet tightly with aluminum foil and bake on the center rack for 1 hour and 15 minutes.
  • Broil Cheese Topping: Remove the skillet from the oven and discard the foil. Increase the oven temperature to broil (500°F/260°C). Sprinkle the grated Gruyère and Parmesan cheeses evenly over the potatoes, followed by the fresh thyme or chives. Broil for 3–5 minutes, or until the cheese is golden and bubbling.
  • Rest and Serve: Allow the gratin to cool for 15 minutes to set before serving.

Notes

Note: For optimal crispness, use a cast iron skillet and ensure the broiling step is closely monitored to prevent burning.
 
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