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Instructions:
- Preheat oven to 375°F (190°C).
- In a large skillet over medium heat, melt butter with olive oil. Add sliced onions, sugar, and salt. Cook, stirring often, for 20–25 minutes until onions are deeply golden and caramelized.
- Add garlic and thyme, cooking for another minute until fragrant.
- Pour in beef broth and Worcestershire sauce, scraping up any browned bits from the pan. Let simmer for 2–3 minutes.
- In a large baking dish, arrange the halved potatoes. Pour the onion-broth mixture over them and toss to coat evenly.
- Cover with foil and bake for 30–35 minutes, or until potatoes are fork-tender.
- Remove foil, sprinkle with cheese, and bake uncovered for another 10 minutes until the cheese is melted and bubbly.
- Garnish with extra thyme and serve hot.
Variations :
- Swap beef broth for vegetable broth to make it vegetarian.
- Try smoked Gouda or Fontina cheese instead of Gruyère for a unique twist.
- Add crispy bacon bits over the top before baking for an extra savory punch.
Tips :
- For richer flavor, stir a splash of heavy cream into the onion mixture before baking.
- Use a mandoline slicer for evenly cut onions that caramelize beautifully.
- If you like extra crispy cheese, broil for 1–2 minutes at the end.