Image of Restaurant-Style French Onion Soup

Restaurant-Style French Onion Soup

Prep Time: 20 min
Cook Time: 75 min

Ingredients

  • ½ cup butter
  • 8 onions, sliced
  • 2 cloves garlic, crushed
  • ½ teaspoon salt, or to taste
  • ½ teaspoon ground black pepper, or to taste
  • 1 teaspoon dried thyme
  • 1 cup red wine
  • 1 tablespoon sherry
  • 2 tablespoons all-purpose flour
  • 2 quarts beef broth
  • 1 French baguette, cut into 1/2-inch thick slices
  • olive oil, or as needed
  • 6 slices Swiss cheese
  • 6 slices provolone cheese