1. Heat oven to 400ยบ F. Arrange four 10-ounce oven-safe soup bowls on a baking sheet. Divide the broth and onions among them. Add 1 tablespoon of sherry to each. Float a slice of bread in each bowl and top with a slice of cheese. Bake 12 to 15 minutes or until the cheese is melted and the soup is bubbling.
