Yes! You can! Since the Ninja Foodi Grill has an air-crisp function, it cooks hard-boiled eggs just like any other air fryer can. Using an air fryer to hard boil your eggs means that you don't have to boil water on the stove top and the process is pretty hands-off. Simply set the temperature and timer, put the eggs in the air fryer basket, let them cook, and then put them in an ice bath when they are finished cooking!