01 - Preheat oven to 425°F. Line a baking sheet with parchment paper.
02 - In a large bowl, toss halved Brussels sprouts with olive oil, sea salt, black pepper, and garlic powder if using until evenly coated.
03 - Spread Brussels sprouts in a single layer on the baking sheet, cut side down for optimal caramelization.
04 - Roast for 20 to 25 minutes, stirring halfway through until golden brown and crispy on edges.
05 - Remove from oven and immediately drizzle with balsamic vinegar; toss to coat evenly.
06 - Transfer to serving dish and sprinkle with Parmesan cheese if desired. Serve hot.