Preheat the air fryer to 160°C (320°F) and set the timer for 20 minutes. Grease and line a suitable baking tin with nonstick baking paper. I use a 20cm (8") square tin in my air fryer, but you may need to use a different size tin. You can also use a firm sided silicone tin, provided it fits inside your air fryer (please note silicone does not conduct heat in quite the same way as metal, so the flapjacks may take a few minutes longer to cook).