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Close-up of a rich French Onion Potato Bake with a golden, crispy top and creamy layers, garnished with rosemary.

French Onion Potato Bake

This French Onion Potato Bake is a creamy, cheesy casserole layered with caramelized onions, tender Yukon Gold potatoes, and melted Gruyère.
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Prep Time 30 minutes
Cook Time 50 minutes
Resting Time 10 minutes
Total Time 1 hour 30 minutes
Servings: 8 servings
Course: Side Dish
Cuisine: French
Calories: 330
Ingredients Equipment Method Nutrition Notes

Ingredients
  

For the Bake
  • 4 large yellow onions
  • 2 pounds Yukon Gold potatoes
  • 4 tablespoons butter
  • 1.5 cups beef broth
  • 2 cups shredded Gruyère or Swiss cheese
  • 1 teaspoon dried thyme
  • 2 cloves garlic, minced
  • 1 teaspoon salt
  • 0.5 teaspoon black pepper

Equipment

  • Large skillet
  • Baking dish
  • Mandoline (optional)

Method
 

  1. Melt butter in a large skillet over medium-low heat. Add sliced onions and cook for 30–40 minutes until caramelized. Stir in garlic and thyme during the last 5 minutes.
  2. Preheat the oven to 375°F. Thinly slice potatoes evenly, preferably with a mandoline.
  3. In a greased baking dish, layer potatoes, caramelized onions, and shredded cheese. Repeat until all ingredients are used. Pour beef broth over the top.
  4. Cover with foil and bake for 35 minutes. Uncover and bake an additional 20–25 minutes until the top is golden and bubbly.
  5. Let the dish rest for 10 minutes before serving. Garnish with fresh thyme or chives if you want.

Nutrition

Calories: 330kcalCarbohydrates: 32gProtein: 11gFat: 19gSaturated Fat: 10gCholesterol: 40mgSodium: 600mgFiber: 3gSugar: 2g

Notes

This is great for holidays or any day you need a hearty, oven-baked classic.

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