Make a foil packet or pouch and put the kernels on top, making sure it fits your air fryer and is rolled up on the sides. Make sure this is an even layer.
Spray the kernels with grapeseed oil cooking spray.
Cook at 390*F for 15 minutes, checking in on it carefully around 5 minutes and 10 minutes. When checking on it be very careful because when the kernels get exposed to hot air, they pop. Be sure the lid is nice and sealed on the air fryer.
Carefully remove once done and discard the kernels that didn't pop and serve with the seasoning of choice.
Preheating -I do not preheat the air fryer to make this. If you do then decrease the time by the amount of time your air fryer has preheated or check in on the popcorn.All air fryers heat differently as noted in the post, be sure to watch closely the first time this is made.