On a parchment lined sheet pan, mound some homemade croutons in circles the same diameter as your serving bowls. Cover with shredded or thin slices of gruyere. Place under broiler until cheese melts. I keep the oven door open and watch. It won't take long. Then take a spatula and transfer the portions to the hot soup in the serving bowls. Easier than navigating soup filled bowls in and out of the oven to melt cheese.
On a parchment lined sheet pan, mound some homemade croutons in circles the same diameter as your serving bowls. Cover with shredded or thin slices of gruyere. Place under broiler until cheese melts. I keep the oven door open and watch. It won't take long. Then take a spatula and transfer the portions to the hot soup in the serving bowls. Easier than navigating soup filled bowls in and out of the oven to melt cheese.