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Using cooking oils that can stand up to a high temperature is key.
Extra virgin olive oil is not an air fry-friendly oil due to its low smoke point, but extra light olive oil can be used for air frying because of its high smoke point.
Other types of olive oil and some vegetable oils smoke at lower temperatures, meaning they will cause food to dry up quickly and prevent them from getting crispy, so in addition to extra light olive oil - avocado, grapeseed, and peanut oil are great for achieving crispy goodness when air frying.
For best results brush on lightly or spray an even coat of cooking spray made from these oils.