Wash and slice the brussels sprouts in half.
In a large bowl combine seasonings: olive oil, garlic powder, onion powder, parmesan cheese, salt and pepper.
Add brussels sprouts to the bowl and toss together with the seasoning mixture until fully coated.
Add the brussels sprouts to air fryer at 350°F and cook for 6 minutes, then give a quick toss.
Cook an additional 6-10 minutes, or until they're golden brown and crispy on the outside. Add to a plate and toss with extra grated parmesan cheese.