Preheat the oven to 425 degrees. Line a baking sheet with parchment paper and set aside.
In a large mixing bowl, toss the brussels sprouts in olive oil until evenly coated. Add the parmesan cheese, garlic powder, salt and pepper.
Spread the brussels sprouts in an even layer on the sheet pan. Bake in the oven for 20 minutes. Remove from oven and garnish with additional parmesan cheese then serve.