Preheat the oven to 400°F. Coat a large baking sheet with cooking spray.
Bring a medium pot of water to a boil. Add the cauliflower and cook for 1 minute.
Drain and transfer the cauliflower to the prepared baking sheet.
Spray the cauliflower with cooking spray, then sprinkle with the Parmesan and season with pepper.
Bake until the cheese is golden brown, about 10 minutes.
