Caramelize the onions: In a large skillet, melt butter and olive oil over medium heat. Add sliced onions, salt, pepper, and sugar. Cook for 25–30 minutes, stirring occasionally, until the onions turn a deep golden brown.
Add flavor: Stir in garlic, Worcestershire sauce, and thyme. Cook another minute, then pour in the beef broth. Simmer for 10 minutes, letting the flavors blend beautifully.
Prepare your baking dish: Lightly grease a 9×13-inch casserole dish. Layer half the toasted bread slices on the bottom.
Assemble: Spoon half the onion mixture over the bread, then sprinkle with half the cheese. Repeat the layers: bread, onions, and the rest of the cheese on top.
Bake: Preheat your oven to 375°F (190°C). Cover the dish with foil and bake for 20 minutes. Remove the foil and bake another 10–15 minutes, until bubbly and golden brown on top.
Serve: Let rest for a few minutes before serving — the aroma is irresistible! Pair with a fresh green salad or roasted vegetables for a complete meal.
💡 Tips:
For a deeper flavor, use homemade beef broth or add a splash of sherry to the onion mixture.
You can prepare it ahead of time and bake just before serving.
Try topping with crispy fried onions for extra texture.
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