Line the air fryer basket with parchment and spray lightly with oil.
Pour some water into a small bowl.
In a medium bowl, mix together the chicken, scallions, onions, soy sauce, rice vinegar, garlic, and ginger.
Working in small batches, lay out the wonton wrappers on a work surface.
Place 1 tablespoon of the chicken mixture in the center of each wrapper.
Using your finger, moisten the edges of the wonton wrapper with water and fold into a triangle. Press the edges to seal. Repeat with the remaining wrappers.
Place the potstickers in a single layer in the prepared basked and spray liberally with oil. You may need to work in batches, depending on the size of your air fryer.
Cook at 400°F for 5 to 6 minutes, or until golden brown and crispy.
Serve hot with the sauce on the side for dipping.