Add the broccoli into a mixing bowl. Toss through the olive oil, then sugar, salt, pepper, and red pepper flakes.
Preheat the air fryer to 200C/400F for 5 minutes.
Add the broccoli and cook for 8 minutes, flipping halfway through.
Notes
TO STORE: Put the leftovers in the airtight container and store in the refrigerator for up to 5-7 days. TO FREEZE: Place the cooked and cooled broccoli in a ziplock bag and store it in the freezer for up to 6 months. TO REHEAT: Reheat in the oven, skillet or air fryer.