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French Onion Beef and Potato Casserole with Gruyère Topping

Close-up of a layered slice of french onion beef and potato bake with melted cheese topping.
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Create a hearty, comforting bake that captures the deep, savory flavor of French Onion Soup using simple ingredients like ground beef, sliced potatoes, and rich caramelized onions, all topped with melted Gruyère cheese.

Ingredients

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

Instructions

  1. Preheat your oven to 375 degrees Fahrenheit. Lightly grease a 9×13 inch baking dish.
  2. Heat the olive oil in a large skillet over medium heat. Add the sliced onions and cook slowly, stirring occasionally, for 20 to 25 minutes until they are deeply caramelized and brown. Add 1/2 teaspoon of salt during the last 5 minutes of cooking. Remove the onions from the skillet and set them aside.
  3. Add the ground beef to the same skillet. Cook over medium-high heat, breaking it up with a spoon, until it is fully browned. Drain off any excess grease. Season the beef with the remaining 1/2 teaspoon of salt and 1/2 teaspoon of pepper.
  4. Sprinkle the flour over the cooked beef and stir for one minute. Pour in the beef broth and Worcestershire sauce. Stir in the dried thyme. Bring the mixture to a simmer and cook until the sauce thickens slightly, about 3 minutes. Return the caramelized onions to the skillet and stir to combine.
  5. Arrange half of the thinly sliced potatoes in an even layer in the bottom of the prepared baking dish. Pour half of the beef and onion mixture over the potatoes.
  6. Layer the remaining potatoes over the beef mixture. Pour the remaining beef and onion sauce evenly over the top layer of potatoes.
  7. Cover the baking dish tightly with aluminum foil. Bake for 45 minutes.
  8. Remove the foil and sprinkle the shredded Gruyère 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 bubbly.
  9. Let the casserole rest for 10 minutes before serving.

Notes

  • For the best French Onion flavor, take your time caramelizing the onions; this step builds deep, rich flavor.
  • If you prefer a softer potato layer, you can briefly microwave the sliced potatoes for 3 minutes before layering them in the dish.
  • You can substitute Gruyère cheese with Swiss cheese or Provolone if needed.

Nutrition

Find it online: https://tastethisplate.com/french-onion-beef-and-potato-bake/