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Creamy Gruyère Scalloped Potatoes with Caramelized Onions

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A comforting and elegant side dish featuring thinly sliced Yukon Gold potatoes layered with slow caramelized onions and a creamy Gruyère cheese sauce, enhanced with fresh thyme.

Ingredients

Scale
  • 3 pounds Yukon Gold potatoes, peeled and thinly sliced (about 1/8 inch thick)
  • 1 large yellow onion, thinly sliced
  • 2 tablespoons unsalted butter
  • 1 teaspoon sugar (optional)
  • 3 cups whole milk
  • 1 cup heavy cream
  • 3 tablespoons all-purpose flour
  • 2 cups grated Gruyère cheese
  • 2 cloves garlic, minced
  • 1 teaspoon salt
  • ½ teaspoon freshly ground black pepper
  • Fresh thyme leaves from 3-4 sprigs

Instructions

  1. Preheat your oven to 375°F (190°C). Lightly butter your 9×13 inch baking dish and set aside.
  2. Caramelize the onions: In a large skillet, melt 2 tablespoons butter over medium-low heat. Add the thinly sliced onions and sprinkle 1 teaspoon sugar (optional). Cook slowly, stirring occasionally, until onions are deep golden brown and sweet—about 25-30 minutes. If they start to stick, add a splash of water. Remove from heat and set aside.
  3. Prepare the creamy Gruyère sauce: In a medium saucepan, melt 3 tablespoons butter over medium heat. Add minced garlic and cook for 1 minute until fragrant. Whisk in 3 tablespoons flour and cook for 2 minutes, stirring constantly to avoid lumps.
  4. Slowly whisk in 3 cups whole milk and 1 cup heavy cream. Continue whisking until the sauce thickens and bubbles gently, about 5-7 minutes.
  5. Remove from heat and stir in 2 cups grated Gruyère cheese, salt, pepper, and fresh thyme leaves. Stir until cheese melts and sauce is smooth.
  6. Layer the potatoes: Arrange a layer of potato slices on the bottom of the prepared dish, slightly overlapping. Spread a portion of caramelized onions over the potatoes, then spoon some of the cheese sauce over them. Repeat layers until all potatoes, onions, and sauce are used, finishing with a layer of cheese sauce on top.
  7. Bake uncovered for 50-60 minutes. The potatoes should be tender when pierced with a fork, and the top golden and bubbly. If the top browns too quickly, tent loosely with foil.
  8. Let the dish rest for 10-15 minutes before serving to help the sauce thicken and make it easier to slice.

Notes

Slice potatoes uniformly thin for even cooking. Cook onions low and slow to avoid bitterness. Let dish rest before serving to thicken sauce. Tent with foil if top browns too quickly. Can substitute Russet potatoes for fluffier texture. For gluten-free, replace flour with gluten-free blend or cornstarch (half amount). Dairy-free versions can use plant-based milk and vegan cheese.

Nutrition

Keywords: scalloped potatoes, Gruyère cheese, caramelized onions, creamy potatoes, comfort food, holiday side dish, thyme, easy recipe

Find it online: https://freshforkful.com/creamy-gruy-e-re-scalloped-potatoes-with-caramelized-onions-easy-recipe/