Wash the asparagus and dry them properly.
Slice off the bottom white and woody ends.
Add them into a large mixing bowl and drizzle with olive oil.
Sprinkle salt and pepper. Mix thoroughly. (Make sure to coat each spear is evenly coated with oil.)
Place the seasoned asparagus in the air fryer basket and spread them evenly.
Preheat your air fryer by setting the temperature to 360ºF.
When the air fryer is ready, take the basket out. Spread the asparagus in the basket evenly.
Put back the basket, and set the timer for 8 minutes.
After 4 minutes, take out the basket and gently flip the asparagus.
Return the basket to the air fryer and check every minute until it’s cooked through.
Top with more salt, pepper, and optional parmesan cheese. Serve warm.