01 - Preheat oven to 425°F and 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 the sprouts cut side down in a single layer on the prepared baking sheet for optimal caramelization.
04 - Roast for 20 to 25 minutes, turning once halfway through, until sprouts are golden brown and crispy on the edges.
05 - Remove from oven, drizzle with balsamic vinegar and sprinkle with Parmesan cheese if desired before serving.