01 - Preheat oven to 425°F. Line a rimmed baking sheet with parchment paper.
02 - In a large mixing bowl, combine the Brussels sprouts with olive oil, balsamic vinegar, honey, salt, and pepper. Toss until every sprout is evenly coated.
03 - Spread the Brussels sprouts cut side down on the prepared baking sheet in a single, even layer without overcrowding.
04 - Roast for 20 to 25 minutes, tossing once halfway through, until the sprouts are deeply golden and caramelized on the edges.
05 - Transfer to a serving dish and sprinkle with toasted nuts or grated Parmesan if desired. Serve immediately.