Ingredients
- 1/2 c. (1 stick) butter, divided
- 2 large onions, sliced into half moons
- 2 tsp. fresh thyme, plus more for garnish
- kosher salt
- Freshly ground black pepper
- 2 cloves garlic, minced
- 1/2 c. beef broth
- 1 large boule
- 1 1/2 c. shredded Gruyere
- 1 1/2 c. shredded mozzarella
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