Transfer frozen broccoli florets to a large mixing bowl.
Add olive oil, salt, pepper, garlic powder, onion powder, and red pepper flakes and toss well.
Spray the air fryer basket with olive oil spray.
Then place the frozen broccoli florets in the basket and spread them evenly. Do not overload the basket.
Air fry at 400 degrees for 10 minutes.
Pull out the basket and stir the broccoli. Air fry for another 5-8 minutes until the desired level of crispiness.
Transfer the broccoli to a serving platter and drizzle with 1 tablespoon freshly squeezed lemon juice. Serve immediately, topped with parmesan cheese if desired.