Preheat oven to 400°F (200°C).
Toss Brussels sprouts with olive oil, salt, and pepper on a large rimmed baking sheet.
Arrange the sprouts in a single layer with the flat cut-sides facing down to ensure maximum browning.
Roast for 20 to 25 minutes until the sprouts are tender and the outer leaves are charred.
Whisk together the balsamic vinegar and maple syrup in a small bowl.
Drizzle the glaze over the roasted sprouts and toss well to coat.
Return the pan to the oven for an additional 2 to 3 minutes until the glaze has thickened and adhered to the sprouts.
Remove from oven and serve immediately.