If the crab rangoon was originally air fried, you may want to give it a spray or brush of oil. If it was deep-fried, you can skip this step.
Add the leftover crab rangoon to the air fryer basket in a single layer.
Air fry for 3 minutes and check if they are hot and crispy. If needed you can air fry for an additional 1-2 minutes. (Time may vary slightly for your brand of air fryer).
Video
Notes
Storage: You can put the reheated Rangoon back in the fridge in a sealed container. They shouldn't be stored for more than a total of 4 days (including previous time refrigerated).
Reheating: Reheat using the air fryer in the same manner (The edges may become a little darker from reheating again).
Freezing: Place the Rangoon on parchment paper on a baking sheet. Once frozen, place them carefully in a freezer bag to store.