Break the graham crackers into halves and lay half of them flat out in a single layer in the air fryer. Set aside the remaining squares.
Use a knife or scissors to cut the marshmallows in half then press the sticky side onto the graham cracker squares. This will help the marshmallows stay in place so they don’t move around and cause a gooey mess in the air fryer.
Air fry at 360℉ for 4 minutes.
Open the air fryer and then top each square with 3 pieces broken off of Hershey’s chocolate bar and then air fry for an additional 1 minute.
Remove from the air fryer and then top with the remaining graham cracker squares that were set aside earlier.