Wash and dry the sweet potato
Pierce it several times with a fork
Rub with a little oil if desired
Sprinkle with salt if desired
Preheat the air fryer to 375°F
Place the sweet potato in the air fryer basket
Air fry for 35 to 45 minutes
Turn it halfway through cooking
Check for doneness with a fork
Cook longer if needed until tender
Remove from the air fryer
Slice open and serve