French Onion Soup Casserole
Ingredients
- 3 tablespoons unsalted butter
- 2 tablespoons olive oil
- 4 medium yellow onions, thinly sliced
- 2 stalks celery, peeled and thinly sliced
- Kosher salt and freshly ground black pepper
- 2 bay leaves
- 2 to 3 sprigs thyme, plus 1 teaspoon fresh leaves
- 1 tablespoon all-purpose flour
- 1 cup low-sodium beef broth
- 1/2 cup dry white wine
- 1/2 baguette, thinly sliced (about 4 ounces)
- 4 ounces shredded Gruyere cheese (about 2 cups)
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