01 -  Preheat the air fryer to 375°F for 3 to 5 minutes to ensure even cooking. 
 02 -  In a large mixing bowl, combine broccoli florets, olive oil, minced garlic, salt, black pepper, and red pepper flakes. Toss thoroughly until the broccoli is evenly coated. 
 03 -  Transfer the seasoned broccoli to the air fryer basket, spreading it in a single layer for optimal crispiness. 
 04 -  Air fry at 375°F for 10 to 12 minutes, shaking the basket halfway to promote uniform browning and texture. 
 05 -  Once golden and crisp, remove broccoli from the air fryer. Sprinkle with grated parmesan cheese and drizzle with lemon juice if desired. Serve immediately.