To get a really crispy crust, here are a few important tips: 1. Make sure to preheat your air fryer. 2. Line your air fryer basket with parchment paper specifically designed for air fryers. The parchment paper I use has holes in it which allows the air to circulate around all the sides of the seitan chicken. 3. Use a pastry brush to spread vegetable oil on both sides of the battered vegan chicken. 4. Flip the seitan during the cooking time.