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french onion scalloped potatoes

french onion scalloped potatoes
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This French Onion Scalloped Potatoes recipe is a comforting, creamy, and cheesy side dish featuring tender sliced potatoes layered with rich caramelized onions and a luscious Gruyère cheese sauce. Perfect for weeknight dinners or holiday feasts, this dish is easy to prepare, make-ahead friendly, and customizable to fit various dietary preferences.

Ingredients

Scale

Potatoes

  • 2 to 3 pounds Russet or Yukon Gold potatoes, peeled and thinly sliced

Onions & Aromatics

  • 4 large yellow onions, thinly sliced
  • 2 cloves garlic, minced
  • 1 teaspoon fresh thyme leaves (optional)
  • Salt and black pepper, to taste

Dairy & Fat

  • 3 tablespoons unsalted butter
  • 3 tablespoons all-purpose flour
  • 1 cup whole milk
  • 1 cup heavy cream
  • 2 cups Gruyère cheese, shredded

Instructions

  1. Caramelize the Onions: Melt butter in a large skillet over medium heat. Add the thinly sliced yellow onions and a pinch of salt. Cook slowly, stirring often, for 25 to 30 minutes until the onions turn golden brown and caramelized, developing a deep sweet flavor.
  2. Prepare the Creamy Sauce: Sprinkle the flour over the caramelized onions, stirring continually for 1 minute to remove the raw flour taste. Gradually whisk in the milk and heavy cream, stirring constantly until the sauce thickens to a smooth and velvety consistency. Season with salt, pepper, and minced garlic. Add fresh thyme if desired.
  3. Slice the Potatoes: While the sauce simmers, wash, peel, and slice the potatoes thinly and evenly, ideally using a mandoline for uniform layers that cook evenly.
  4. Assemble the Layers: Lightly grease a baking dish with butter. Arrange a layer of potato slices on the bottom. Spoon over some of the caramelized onion cream sauce, then sprinkle a handful of shredded Gruyère cheese. Repeat layering potatoes, sauce, and cheese until all ingredients are used, finishing with a cheese layer on top.
  5. Bake to Perfection: Cover the dish with foil and bake in a preheated oven at 375°F (190°C) for 45 minutes. Remove the foil and continue baking for another 15 to 20 minutes until the top is golden brown and bubbly. Let the dish cool for a few minutes before serving.

Notes

  • Use a mandoline slicer for uniformly thin potato slices to ensure even cooking.
  • Caramelize onions slowly over medium-low heat to develop rich, deep flavor.
  • Make sure to get sauce in between every potato slice to keep the dish moist and flavorful.
  • Allow the casserole to rest 10 minutes after baking to set and make serving easier.
  • Gruyère cheese is recommended for its perfect melting quality and nutty taste, but other cheeses like sharp cheddar or mozzarella can be substituted.

Nutrition

Keywords: French onion scalloped potatoes, creamy scalloped potatoes, caramelized onion potatoes, cheesy potato casserole, comfort food, make-ahead side dish

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