Preheat the oven to 425°F (220°C). Line a large baking sheet with parchment paper.
Wash the broccoli florets and dry them thoroughly using a clean kitchen towel or paper towels.
Place the broccoli on the baking sheet and drizzle with olive oil.
Sprinkle with garlic powder, salt, and black pepper, then toss until evenly coated.
Spread the broccoli into a single layer, leaving space between florets to ensure proper roasting.
Sprinkle the grated Parmesan evenly over the broccoli, focusing on the tops and sides.
Bake for 15–20 minutes, until the broccoli is tender and the Parmesan is golden and crispy.
Optional: Broil for 1-2 minutes at the end for extra crispiness, watching closely to prevent burning.
Remove from the oven and serve immediately.