French Onion and Mushroom Soup with Bourbon and Swiss Cheese Recipe | James Beard Foundation

Ingredients

• 4 tablespoons olive oil, divided
• 1 red onion, thinly sliced
• 1 yellow onion, thinly sliced
• 4 tablespoons butter, divided
• 1 1/2 pounds mixed mushrooms, such as portabella, oyster, white, and crimini
• 1/4 cup dry sherry
• Salt and pepper to taste
• 1 teaspoon finely chopped shallots
• 1/2 teaspoon chopped garlic
• 1/2 cup bourbon
• 5 cups beef broth
• 2 teaspoons chopped fresh thyme leaves, plus extra for serving
• 2 tablespoons flour
• 6 slices baguette, toasted
• 6 slices Swiss cheese
• 1/4 cup shredded Parmesan cheese