Preheat the oven to 425°F with a rack in the center position.On a large rimmed sheet pan, toss the cauliflower with the olive and arrange in a single layer
Evenly sprinkle the cauliflower with the salt, garlic powder, and red pepper flakes.Roast the cauliflower for 20 minutes
Remove the sheet pan from the oven
Turn the cauliflower and roast for another 10 minutes, or until browned and tender
Remove the sheet pan from the oven
Sprinkle with Parmesan cheese, then roast until the cheese is melted and browned, about 5 minutes more
