Begin by preheating your air fryer to 350°F.
In a spacious bowl, combine the broccoli florets with olive oil, tamari, and garlic powder. Make sure to thoroughly coat the tops of the florets with the mixture, using your hands if needed, to prevent the tops from burning while the stems cook.
Arrange the broccoli in a single layer inside the air fryer basket, ensuring there's a bit of space between each piece. If necessary, cook the broccoli in batches.
Air fry for 8 to 10 minutes, turning the florets halfway through, until they are tender and have developed a rich, golden color. For an extra kick, sprinkle with red pepper flakes and sesame seeds before serving hot.