Preheat your air fryer to 375°F (190°C) for about 5 minutes.
Trim the tough ends of the broccolini stems and place them in a mixing bowl.
Drizzle olive oil over the broccolini, then sprinkle with garlic powder, salt, and pepper. Toss until the broccolini is evenly coated.
Once the air fryer is preheated, arrange the seasoned broccolini in a single layer in the air fryer basket. Do not overcrowd the basket; you may need to cook the broccolini in batches.
Cook the broccolini in the air fryer at 375°F (190°C) for 8-10 minutes, shaking the basket halfway through cooking, until the broccolini is crispy and tender.
Once the broccolini is cooked to your liking, remove it from the air fryer and transfer it to a serving plate.
Zest a small lemon over the seasoned broccolini and toss to combine.
Serve immediately and enjoy!
That's it! Crispy air fryer broccolini is ready to be enjoyed as a delicious and healthy side dish with your favorite main course.