Preheat your air fryer to 375°F (190°C) for about 5 minutes.
Trim and halve the Brussels sprouts, discarding any yellowed leaves.
In a large bowl, toss the halved Brussels sprouts with olive oil, garlic powder, salt, and pepper until evenly coated.
Place the Brussels sprouts in the air fryer basket in a single layer, working in batches if necessary.
Air fry for 15-20 minutes, shaking the basket halfway through for even cooking.
Once crispy, remove them from the air fryer and drizzle with balsamic glaze, if desired.
Serve immediately for the best texture and flavor.