Tender sliced potatoes smothered in caramelized onions, beefy broth, and gooey melted cheese — this French Onion Potatoes recipe turns a humble side dish into a show-stopping star.
📝 Description
Imagine the deep, savory flavors of classic French onion soup… now wrap that goodness around tender potato slices, bake them until golden and bubbling, and you’ve got French Onion Potatoes — a rich and comforting dish that’s just as perfect next to a roast as it is served solo with a spoon.
This dish is all about layered flavor. Sweet caramelized onions mingle with beefy broth and creamy cheese, coating thinly sliced potatoes in a luxurious sauce that soaks into every layer. It’s elegant enough for holidays but easy enough for a weeknight dinner. The best part? It’s all baked in one dish.
🧂 Ingredients
- 2 tablespoons unsalted butter
- 1 tablespoon olive oil
- 2 large yellow onions, thinly sliced
- ½ teaspoon sugar
- ½ teaspoon salt
- 2 cloves garlic, minced
- 1 tablespoon all-purpose flour
- 1 cup beef broth
- ½ teaspoon dried thyme
- 2½ pounds russet potatoes, peeled and thinly sliced
- 1½ cups shredded Gruyère cheese (or Swiss cheese)
- ½ cup shredded mozzarella cheese
- Salt and pepper to taste
- Optional: fresh thyme or parsley for garnish
🍳 Instructions
1. Caramelize the Onions
In a large skillet, heat butter and olive oil over medium heat. Add the sliced onions and sprinkle with sugar and salt. Cook slowly, stirring often, for about 20–25 minutes until deeply golden and caramelized. Stir in garlic and cook 1 minute more.
2. Make the Sauce
Sprinkle the flour over the onions and stir to coat. Cook for 1–2 minutes. Slowly pour in the beef broth while stirring. Add thyme. Bring to a simmer and cook until thickened slightly (about 3 minutes). Remove from heat.
3. Assemble
Preheat oven to 375°F (190°C). Grease a 9×13-inch baking dish. Layer half the potatoes in the dish and season with salt and pepper. Spread half of the onion mixture over the top, then sprinkle with half of each cheese. Repeat layers.
4. Bake
Cover with foil and bake for 45 minutes. Remove foil and bake for another 20–25 minutes, or until potatoes are fork-tender and the top is golden and bubbly.
5. Rest & Serve
Let rest for 10 minutes before serving. Garnish with fresh herbs, if desired.
🌟 From Me: Onion Soup Meets Gratin
Want to boost the flavor even more? Stir in a splash of Worcestershire sauce or a dash of white wine to the onion mixture for even richer, more nuanced depth — a nod to authentic French onion soup.
🧠 Tips & Tricks
- Gruyère is king for that classic French onion flavor, but Swiss or provolone work too.
- Use a mandoline to slice potatoes evenly — it helps them cook uniformly.
- Add cream to make it extra rich — pour ½ cup heavy cream over the top before baking.
- Make it ahead: Assemble a day ahead and bake when ready to serve.
🔢 Nutrition Facts (Per Serving – 8 servings)
- Calories: 320
- Fat: 18g
- Carbs: 30g
- Protein: 10g
- Fiber: 3g
- Sugar: 5g
🍽 Serving Suggestions
- Perfect with roast chicken, steak, or pork chops
- Add a side of green beans or steamed broccoli for a full meal
- Make it vegetarian by swapping beef broth for mushroom or vegetable broth
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