01 - Preheat the oven to 425°F and line a baking sheet with parchment paper.
02 - In a large mixing bowl, toss the halved Brussels sprouts with olive oil, salt, and black pepper until evenly coated.
03 - Spread the Brussels sprouts in a single layer on the prepared baking sheet, placing them cut side down for optimal caramelization.
04 - Roast for 20 to 25 minutes, stirring once halfway through, until the sprouts are golden and crisp at the edges.
05 - While still hot, drizzle with balsamic vinegar and honey or maple syrup if using; toss well to coat evenly.
06 - Transfer to a serving dish, garnish with chopped parsley if desired, and serve immediately.