In a mixing bowl, toss the Brussels sprouts with olive oil, salt, pepper, and garlic powder until well-coated.
Spread the Brussels sprouts out in the air fryer basket in a single layer.
Cook the Brussels sprouts for 5 minutes, then pull out the basket and give it a good shake to ensure even cooking. Pop it back in for another 5 minutes, then check on them. The sprouts should be turning crispy and nearly done (if they need a bit more time, cook for another 2 minutes). Shaking the basket frequently, until the sprouts are perfectly crispy.
Once they’re crispy and golden brown, take them out and let them cool for a couple of minutes.
Dive in and enjoy your new favorite way to eat Brussels sprouts!