Mist the air fryer tray or basket with cooking oil spray. Put the frozen potstickers on the prepared tray in a single non-touching layer.
Generously spray the potstickers with cooking spray. Spray the edges of the dumplings really well so they don't get too hard in the air fryer.
Put the tray of dumplings in the top rack position of the air fryer (if using an air fryer oven).
Air fry the dumplings for 5 minutes at 400°F (200°C). Take them out, flip them over, and spray them well with more cooking spray.
Put the tray back in the air fryer (top rack again) and air fry for 4 minutes more at 400°F (200°C).
My dumplings with wheat flour wrappers were done at this point. If your potstickers are not cooked to your liking. flip them one last time and spray with cooking spray. Air fry for 2-3 more minutes at 400°F (200°C). (Note: If you're making potstickers with meat or poultry filling, I would use a meat thermometer to ensure the minimum safe internal temperature of 165°F/74°C has been reached.)
While the dumplings air fry, you can make the dipping sauce. Put the rice vinegar, soy sauce. ginger, and sesame oil in a small canning jar. Put the lid on the jar and shake it up. (If you're using the sauce from the box of dumplings, it often only needs thawing.)
Serve the dumplings with the dipping sauce. Garnish with thinly sliced scallions and sesame seeds.