onion soup recipe

**Ingredients:** - 4 large yellow onions, thinly sliced - 3 tablespoons unsalted butter - 2 tablespoons olive oil - 1 teaspoon salt - 1 teaspoon sugar - 4 cups beef broth (or a mix of beef and chicken broth) - 1 cup dry white wine (optional) - 2 cloves garlic, minced - 2 bay leaves - 2 sprigs fresh thyme (or 1/2 teaspoon dried thyme) - Salt and pepper to taste - 4-6 slices of French bread, toasted - 1 1/2 cups grated Gruyère cheese (or Swiss cheese)