1. Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
2. In a large bowl, toss the halved Brussels sprouts with olive oil, ensuring each piece is well-coated.
3. Add the grated Parmesan, garlic powder, salt, and pepper to the bowl. Mix until the sprouts are evenly coated with the cheese and seasonings.
4. Spread the Brussels sprouts in a single layer on the prepared baking sheet. For extra crispy edges, place them cut-side down.
5. Roast in the preheated oven for 20-25 minutes, or until the sprouts are golden brown and tender, with the cheese forming a crispy crust.
6. If desired, sprinkle a pinch of red pepper flakes over the top before serving for an added kick.

Remember, the key to perfect roasting is not overcrowding the pan. Give those sprouts room to breathe, and they’ll reward you with that beautiful caramelization we all love.