We are bringing the air fryer back out for these Honey Mustard Chicken Burgers! The air fryer gives these burgers an extra crunch that makes them even more delicious. If you like a little bit of spice, you can transform these into spicy honey hot chicken sandwiches by tossing your cooked chicken in buffalo sauce or adding a dash of it into the honey mustard sauce itself! You can substitute boneless skinless chicken thighs for chicken breasts if desired.