Preheat air fryer to 380°F/ 190°C for 2-3 minutes.
Remove chicken nuggets from the refrigerator and lightly spritz (or brush) with oil.
Place leftover nuggets in the air fryer basket in a single layer, ensuring they are not touching [Note 1].
Air fry leftover chicken nuggets at 380°F/ 190°C for 2-3 minute intervals. After each interval, check the internal temperature, flip the nuggets over [Note 2], and continue reheating until the nuggets reach at least 165°F/ 74°C in the center of the thickest part [Note 3].
Notes
Reheat nuggets in batches if necessary.
Flip the nuggets over if required for your air fryer.
Use an instant-read meat thermometer to check the internal temperature.