french onion soup recipe

#### Ingredients: - **4 large onions** (thinly sliced) - **3 tablespoons butter** - **2 tablespoons olive oil** - **1 teaspoon salt** - **1 teaspoon sugar** - **3 cloves garlic** (minced) - **1/4 cup dry white wine** (optional) - **6 cups beef broth** (or a mix of beef and chicken broth) - **1 bay leaf** - **1 teaspoon dried thyme** (or 1 tablespoon fresh thyme) - **Salt and black pepper** (to taste) - **1 baguette** (sliced into rounds) - **2 cups grated Gruyère cheese** (or Swiss cheese)