Ingredients
Method
- Melt butter in a large pot over medium-low heat.
- Slowly cook onions 25 minutes, until deep brown and caramelized.
- Add mushrooms; cook 5 more minutes.
- Add broth; bring to a simmer and cook 10 minutes.
- Ladle into oven-safe bowls; top each with baguette and a handful of gruyere.
- Broil 2 to 3 minutes, until cheese melts and bubbles.
