You most certainly can (I've tested it out of sheer curiosity). But be aware that air-fried beignets turn out lighter and a little dry, more like a breadstick. Preheat the air fryer to around 340° F, and fry for two to four minutes (timing in your air fryer will take a little trial and error). Flip the beignets halfway through frying. Unlike frying in oil, coat the hot beignets in powdered sugar the moment you take them out.