Prep the broccolini by washing it and trimming off the ends.
Add the broccolini to a mixing bowl and top with olive oil, salt, pepper, and garlic powder.
Use a spoon to toss broccolini in the seasonings and coat them evenly.
Open up the air fryer and use tongs or a spatula to move broccolini into the basket.
Close up the air fryer and heat it to 375 degrees for 8 minutes. Halfway though cooking time, open up air fryer and carefully flip broccolini over for more even roasting.
Once broccolini is done cooking, use tongs or a spatula to move it from the air fryer basket to a serving plate.