Preheat the air fryer to 400F.
Trim the broccolini and arrange it in a dish or bowl. Set aside.
In a small bowl, add the Brazilian sofrito, the olive oil, the soy sauce, the cayenne (if using), and the salt and pepper, and whisk to combine.
Massage the sauce over the broccolini.
Arrange the seasoned broccolini in the tray of the pre-heated air fryer in a single layer. (Do not overcrowd or the broccolini will not crisp up.)
Air fry for 5 to 6 minutes, or until crispy.
