French Onion Chicken Soup

Bahan-bahan (6 porsi)

• 4 cups sweet onion (thinly sliced (from 4 medium/large))
• 2 cups shallot (thinly sliced (from about 4))
• 1 teaspoon kosher salt
• 1 2/3 tablespoons extra virgin olive oil
• 2 tablespoons all purpose flour (or gluten-free flour)
• ¼ cup light white wine (se note above)
• ¼ cup sherry vinegar
• 4 fresh thyme sprigs
• 2 dried bay leaves
• 8 cups chicken bone broth (I used Swanson Chicken Bone Broth)
• 1 pound boneless skinless chicken thighs (or chicken breast)
• 6 slices baguette ( or sourdough bread, 1/2 ounces each* toasted)
• 12 thin slices Gruyere cheese (or Swiss cheese, 6 ounces total)