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Easy French Onion Potato Bake

A thick, square slice of french onion potato bake with layers of tender potatoes and a golden, cheesy crust.
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This recipe delivers the rich, savory flavor of French onion soup combined with tender, creamy potatoes in a simple casserole format. It is a comforting side dish perfect for weeknights or holiday meals.

Ingredients

Scale
  • 2 tablespoons butter
  • 1 tablespoon olive oil
  • 2 large yellow onions, thinly sliced
  • 1 teaspoon salt, divided
  • 1/2 teaspoon black pepper, divided
  • 2 pounds Russet potatoes, peeled and thinly sliced (about 1/8 inch thick)
  • 1 cup beef broth
  • 1/2 cup heavy cream
  • 1 tablespoon all-purpose flour
  • 1 teaspoon dried thyme
  • 1 cup shredded Gruyère cheese
  • 1/2 cup shredded Parmesan cheese

Instructions

  1. Preheat your oven to 375 degrees Fahrenheit. Lightly grease an 8×8 inch baking dish.
  2. In a large skillet over medium heat, melt the butter with the olive oil. Add the sliced onions, 1/2 teaspoon of salt, and 1/4 teaspoon of pepper. Cook slowly, stirring occasionally, for 20 to 25 minutes until the onions are deeply caramelized and sweet. Remove the onions from the skillet and set them aside.
  3. In the same skillet, whisk together the beef broth, heavy cream, and flour until smooth. Bring the mixture to a simmer over medium heat, stirring constantly until it thickens slightly, about 3 minutes. Stir in the dried thyme, remaining 1/2 teaspoon of salt, and 1/4 teaspoon of pepper. Remove from heat.
  4. Arrange half of the sliced potatoes in an even layer in the prepared baking dish. Sprinkle half of the caramelized onions over the potatoes. Pour half of the cream sauce evenly over the layer.
  5. Repeat the layering process with the remaining potatoes, onions, and sauce.
  6. Cover the baking dish tightly with aluminum foil. Bake for 45 minutes.
  7. Remove the foil. Sprinkle the Gruyère cheese and Parmesan cheese evenly over the top. Return the dish to the oven, uncovered, and bake for another 15 to 20 minutes, or until the potatoes are tender when pierced with a fork and the cheese is melted and golden brown.
  8. Let the potato bake rest for 10 minutes before slicing and serving.

Notes

  • For quicker caramelization, add a pinch of sugar to the onions while cooking.
  • If you are short on time, you can substitute store-bought caramelized onions, though the flavor will be less deep.
  • Use a mandoline slicer for uniform potato slices, which helps them cook evenly.

Nutrition

Find it online: https://cookingbyfelix.com/french-onion-potato-bake-recipe/