Place the halved Brussels sprouts into a bowl, then add the olive oil, balsamic vinegar, salt, and pepper and toss to coat.
Using an Air Fryer, spread the Brussels sprouts into the basket.
Close and turn the air fryer to 200 degrees and set the timer to 5 minutes.
Once the timer beeps, open the air fryer and carefully mix the Brussels sprouts around.
Spread them in an even layer, then sprinkle the crumbs and cheese over the tops.
Close the Air Fryer and set for 5 more minutes at 400 degrees.
When the time is up, remove the Air Fryer Crispy Parmesan Brussels Sprouts and serve immediately