Place the broccoli in a large bowl and cover with a damp paper towel to steam in the microwave for 2 to 3 minutes. When it's finished, pat it very dry. It should not be soggy.
In a saucepan that can fit the broccoli, melt the butter and add the lemon pepper and garlic powder. Stir together and then take it off the heat.
Add the broccoli and toss to coat.
Set your air fryer to 375 and air fry for 8 to 10 minutes. Check the broccoli half way through and toss the broccoli around a bit if it looks like things are cooking unevenly. Remove from the air fryer, transfer to a bowl and sprinkle Parmesan cheese over the top. Enjoy immediately!