Steps
1. Melt butter and olive oil in a pot over medium heat. Add onions and cook slowly, stirring often, until deep golden and caramelized, about 25 minutes.
2. Carefully add the brandy to deglaze the pot, scraping up any browned bits. Let it simmer until mostly evaporated.
3. Add beef broth and thyme. Simmer for 10 minutes. Season with salt and pepper.
4. Preheat your oven's broiler.
5. Pour soup into an oven-safe bowl. Lay the baguette slice on top.
6. Mix quickmelt and cheddar cheese, then generously pile it over the bread.
7. Place the bowl under the broiler for 3-5 minutes until the cheese is bubbling and golden brown.
8. Remove carefully, let cool slightly, and serve immediately.