Season the baby broccoli: Add the baby broccoli, olive oil, lemon juice, kosher salt, and garlic powder to a large bowl. Toss until evenly coated.
Air fry: Arrange the baby broccoli in the air fryer basket in an even layer. Air fry at 350°F for 7 minutes, checking halfway through to make sure it is cooking evenly and the florets aren't burning.
Check and serve: The baby broccoli is done when the stalks are tender and the florets are lightly browned and crisp. Serve immediately with additional lemon juice to taste, if desired.
Notes
Baby broccoli: Baby broccoli may also be sold as broccolini. I often buy it at Trader Joe's, but you can find it at many grocery stores.
Air fryer differences: Air fryers vary in how quickly and evenly they cook. Preheat your air fryer if your model requires it, and check the baby broccoli partway through cooking. Toss or turn it if needed for even browning, and adjust the cooking time as needed.
Don't overcrowd the basket: Arrange the baby broccoli in an even layer so the hot air can circulate.
Watch the florets: The thin florets can brown quickly, so keep an eye on them toward the end of cooking, especially if your air fryer runs hot.