Preheat oven to 425°F. Line a large baking sheet with foil for easy cleanup.
In a medium bowl, toss cauliflower with olive oil, stirring until each piece is coated. Add additional oil if needed. Mix in parmesan, salt and pepper.
Spread cauliflower onto baking sheet, allowing space between the pieces. Do not crowd the pan. Bake for 20-25 minutes or until cauliflower is light golden brown and tender.