If you're making the classic French Onion Soup, you should use Gruyère. There's a You certainly can top your soup with whatever kind of cheese you like. But you'll be It also has a hint of nuttiness, that goes well with the soup. Shredded. This satisfying soup is fantastic any autumn or winter day. The blend of Swiss, Parmesan and mozzarella gives it a richness onion-soup lovers will enjoy.” — Gina. Get French Onion Soup Recipe from Food Network. Place bread round, toasted side down, on top of soup and top with grated cheese. Broil until cheese is. Jan 22, French onion soup is so simple, yet rich, luxurious, and deeply comforting. Using the wrong type of cheese cheese. It's the only way to go!. Four-Cheese French Onion Soup. This beef broth is slightly sweet not too salty like so many other soups. Serve this as a first course on special occasions or as. Once soup reaches a boil, ladle it into bowls. Float toasted crusty bread on soup and cover each bowl with a mound of cheese. Sprinkle remaining fresh thyme.