The first and the best method to make sure that chicken is cooked enough, use a meat thermometer. The chicken will be ready when its inner temperature will reach 165ºF (74ºC). If it didn’t reach this temperature, put the meat back in the air fryer and cook for a few more minutes. For this method, you can use the simplest meat thermometer that you have under your hands. The only downside of that is that you will need every time to remove the air fryer basket and check the inner temperature. If you’re a tech and air fryer geek, I can recommend using a fancy meat thermometer with wifi that will connect to your smartphone and it will send you an alert when your meat will rich this specific inner temperature. The second method is to use a fork and a knife to make a small cut in the thicker part of the meat and to check how meat is cooked inside. The downside of this method is that if you will make a few of these cuts, the juice from the meat will throw away and the meat will not be so juicy in the end.