When using an air fryer, it's essential to choose an oil with a high smoke point, as air fryers typically operate at high temperatures. Some of the best oils to use are: avocado oil, refined coconut oil, light olive oil, peanut oil or grapeseed oil. Remember that you don't need a lot of oil when air frying, as the purpose of an air fryer is to use hot air circulation to cook food, mimicking the results of deep frying with minimal oil. Simply spray or lightly coat the food with your chosen oil before placing it in the air fryer.