Feb 19, This Is the Best French Onion Soup You Will Ever Have. Rhoda Boone Again, we asked, “What kind of Swiss cheese?” We narrowed it. 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. 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.
What kind of cheese for french onion soup -