01 - Preheat oven to 425°F. Line a baking sheet with parchment paper.
02 - In a large bowl, mix halved Brussels sprouts with olive oil, sea salt, black pepper, and garlic powder if using, ensuring even coating.
03 - Spread Brussels sprouts cut side down in a single layer on the prepared baking sheet to enhance caramelization.
04 - Roast for 20 to 25 minutes, turning once halfway through, until edges are golden brown and crispy.
05 - Remove from oven; optionally drizzle with balsamic vinegar and sprinkle with grated Parmesan cheese before serving.