Prepare the Brussels sprouts: Wash and trim the tough ends. Remove any yellowed outer leaves. For medium-sized sprouts, slice them in half lengthwise. For very large sprouts, cut them into quarters to ensure even cooking.

Whisk the glaze: In a medium bowl, combine the olive oil, soy sauce, honey, garlic powder, red pepper flakes, salt, and black pepper. Stir until well combined.

Coat the sprouts: Add the prepared Brussels sprouts to the bowl with the glaze. Toss thoroughly until each sprout is evenly coated. Ensure the glaze gets into all the nooks and crannies.

Air fry in batches if necessary: Arrange the coated Brussels sprouts in a single layer in your air fryer basket. Avoid overcrowding to allow for maximum crisping. If your air fryer is small, cook in two batches.

Cook and crisp: Air fry at 199 °C (200 °C) for 10 minutes. Open the air fryer, shake the basket vigorously to redistribute the sprouts, and continue cooking for another 6-10 minutes, or until tender on the inside and nicely browned and crispy on the edges.

Garnish and serve: Once cooked, transfer the Brussels sprouts to a serving dish. Sprinkle with sesame seeds for added texture and visual appeal.