Can I put aluminum foil or parchment paper in an air fryer?

Yes, but with precautions. Perforated parchment liners designed for air fryers work best and make cleanup easy. Regular foil can be used to wrap foods but should never cover the entire basket, as it blocks airflow and reduces crispiness. Never place loose parchment or foil in an empty air fryer during preheating, as it can blow into the heating element and catch fire.