Break the graham crackers in half and place 9 halves in the air fryer. I use a cosori 5.8qt, different sized air fryers may be able to hold more or less.
Cut the marshmallows in half and place the cut sides down on the graham cracker squares. This helps the marshmallow cook more evenly and prevents them from flying around the air fryer.
Cook at 370 degrees F for 4 minutes, then remove from the air fryer and immediately add the peanut butter cups and top with the other half of the graham crackers that weren’t put in the air fryer. Enjoy immediately.