Cut the stem end off of the top of the garlic bulb, exposing the individual cloves.
Dip the entire bulb of garlic in the oil and place in your air fryer basket or tray/trivet or rack.
Set the temperature to 325°F/160°C and the time will be between 25-30 minutes. Smaller bulbs may take less time, so check on them after 15. The roasted garlic is done when the tops are golden brown and there is some give when squeezed on the sides.
Allow the bulbs to cool and then use in your favorite recipes or see the notes for longer storage.
