Preheat your oven to 400°F (200°C).
Wash and trim the ends off the Brussels sprouts. Cut any larger sprouts in half.
In a small bowl, whisk together olive oil, maple syrup, Dijon mustard, salt, and black pepper until well combined.
Place the trimmed Brussels sprouts on a large sheet pan. Drizzle the dressing over them and toss until they're nicely coated.
Roast the Brussels sprouts in your preheated oven for about 20–25 minutes, tossing halfway through.
Remove from the oven and let them cool slightly before serving.
