Preheat oven to 450°F.
Zest lemon. Toss broccoli with olive oil, garlic, lemon zest if using, salt & pepper ensuring all pieces are well coated.
Line a pan with foil and spray with cooking spray. Spread broccoli evenly over pan and roast about 10 minutes or just until tender crisp.
Remove from oven, place in a bowl and immediately toss with parmesan cheese. Serve hot.
(Nutrition information provided is an estimate and will vary based on cooking methods and brands of ingredients used.)