Arrange 6 of the bread slices on a work surface. Top each slice with 1 slice of the Swiss cheese, red onion, chicken mixture, and the second slice of Swiss cheese. Top with the second slice of bread.

This classic recipe features chicken breasts stuffed with thin slices of ham and cheese that are then coated in breadcrumbs and pan-fried. Silky Swiss chard, briny pops of mustard-macerated onions ...

3. Cook burger in frypan, about 5-7 minutes per side. 4. After both sides cooked, place slice of swiss cheese atop the burger, and cover the pan, for about 35-45 seconds until cheese melts.