01 - Preheat the oven to 425°F. Line a large baking sheet with parchment paper.
02 - In a large bowl, toss Brussels sprouts with olive oil, salt, and pepper until well coated.
03 - Spread the Brussels sprouts in a single layer on the prepared baking sheet, cut side down for maximum crispiness.
04 - Roast for 20–25 minutes, stirring halfway through, until golden brown and crispy on the edges.
05 - While the Brussels sprouts roast, combine balsamic vinegar and maple syrup in a small saucepan. Simmer over medium heat for 4–5 minutes, stirring often, until slightly thickened and glossy. Remove from heat.
06 - Transfer the roasted Brussels sprouts to a serving bowl. Drizzle with the balsamic glaze and toss to coat evenly.
07 - Garnish with shaved Parmesan and toasted walnuts, if desired. Serve immediately.