Make small diagonal slices on the top and bottom of each hot dog. They should be about ⅛" deep - ¼" deep at most. For a bun-sized dog, you can fit about 10 slices. This is optional, but helps the dogs crisp and I always do it.
Place the hot dogs in the Air Fryer and cook at 400 F for 5 minutes. You don't need to grease the grate or preheat the Air Fryer. After 5 minutes are up, open the Air Fryer and carefully place each hot dog into a bun. Place the assembled hot dogs + buns back into the Air Fryer. Air Fry for 2 min.
You can either serve your dogs at this point, or add some toppings! I love Chili Cheese Dogs - simply top with chili and a slice of cheese and Air Fry for another 2 minutes and serve.
This recipe easily scales up or down. You can make one hot dog or however many will fit into your Air Fryer without changing the method or cooking times.