I haven't tried it yet, but I'm sure they would work fantastically in an air fryer! Instead of piping into hot oil, pipe onto a baking sheet (as above) and place the sheet tray in the freezer until the churros are solid (30 minutes to an hour minimum). Preheat the air fryer to 400 degrees F and place a few frozen churros into your air fryer basket/tray. Reduce the heat to 375 degrees F and bake for 20 minutes, checking halfway through as all air fryers are different.