01 - Set the air fryer to 375°F and allow it to preheat for 3 to 5 minutes to ensure even cooking.
02 - Combine broccoli florets, olive oil, minced garlic, salt, black pepper, and red pepper flakes (if using) in a large mixing bowl. Toss thoroughly to coat all pieces evenly.
03 - Place the broccoli mixture in the air fryer basket in a single, even layer, avoiding overcrowding.
04 - Cook at 375°F for 10 to 12 minutes, shaking the basket halfway through to promote consistent browning and crispness.
05 - Transfer the crispy broccoli to a serving dish. Optionally top with grated parmesan and a drizzle of lemon juice. Serve immediately.