Prep Time 15 minutes mins
Cook Time 1 hour hr 30 minutes mins
Resting Time 10 minutes mins
Total Time 1 hour hr 55 minutes mins
Ensure the onions are deeply caramelized for the best flavor, as this forms the base of the soup. If you prefer a thicker consistency, you can add an additional tablespoon of flour. When broiling, keep a close eye to prevent the cheese from burning, and serve the soup hot for the best taste experience.