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A close-up of a serving of Creamy Garlic Parmesan Potatoes in a white bowl, showing browned edges and melted cheese.

French Onion Potato Bake

This recipe combines the deep, savory flavor of French onion soup with tender sliced potatoes baked until golden brown. It is an easy side dish that requires minimal hands-on time.
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Prep Time 15 minutes
Cook Time 1 hour
Total Time 1 hour 15 minutes
Servings: 6 people
Course: Side Dish
Cuisine: French
Calories: 350
Ingredients Equipment Method Notes

Ingredients
  

Potatoes and Onions
  • 3 pounds Yukon Gold potatoes thinly sliced
  • 2 large yellow onions thinly sliced
  • 2 tablespoons butter
Sauce
  • 1 cup beef broth low sodium preferred
  • 1 cup heavy cream
  • 1 teaspoon dried thyme
  • 1/2 teaspoon salt
  • 1/4 teaspoon black pepper
Topping
  • 1 cup Gruyère cheese shredded

Equipment

  • 9x13 inch baking dish
  • Large skillet

Method
 

  1. Preheat your oven to 375°F (190°C). Grease a 9x13 inch baking dish.
  2. Melt the butter in a large skillet over medium heat. Add the sliced onions and cook slowly for 15 to 20 minutes, stirring occasionally, until they are deeply caramelized and soft. Remove the onions from the skillet and set aside.
  3. In the same skillet, whisk together the beef broth, heavy cream, thyme, salt, and pepper. Bring the mixture to a simmer over medium heat, then remove from the heat.
  4. Arrange half of the sliced potatoes in a single layer in the prepared baking dish. Top with half of the caramelized onions. Pour half of the cream mixture evenly over the potatoes and onions.
  5. Repeat the layering process with the remaining potatoes, onions, and the rest of the cream mixture.
  6. Cover the baking dish tightly with aluminum foil. Bake for 40 minutes. Remove the foil and sprinkle the shredded Gruyère cheese over the top.
  7. Return the dish to the oven, uncovered, and bake for an additional 20 minutes, or until the potatoes are tender when pierced with a fork and the cheese is melted and lightly browned.
  8. Let the bake rest for 5 to 10 minutes before serving.

Notes

For a deeper onion flavor, you can caramelize the onions ahead of time. If your potatoes are very thick, you may need to add 10 to 15 minutes to the covered baking time to ensure they soften completely.