Rich and Simple French Onion Soup | Recipe Cart

Ingredients

• ½ cup unsalted butter
• 2 tablespoons olive oil
• 4 cups sliced onions
• 4 (10.5 ounce) cans beef broth
• 2 tablespoons dry sherry
• 1 teaspoon dried thyme
• salt and pepper to taste
• 4 slices French bread
• 4 slices provolone cheese
• 2 slices Swiss cheese, diced
• ¼ cup grated Parmesan cheese