Preheat your oven to 400°F (200°C). Line a baking sheet with parchment paper.
Start by preparing the Brussels sprouts. Wash them thoroughly, trim the ends, and cut them in half. If they are large, you can quarter them for even cooking.
Place the halved Brussels sprouts on a baking sheet. Drizzle them with olive oil and season with salt and pepper to taste. Toss them to ensure they are evenly coated with oil and seasoning.
Roast the Brussels sprouts in the preheated oven for about 20-25 minutes or until they are tender and have developed a slight caramelized crust. Be sure to shake the pan or stir the sprouts halfway through the roasting time for even browning.
While the Brussels sprouts are roasting, prepare the balsamic maple glaze. In a small saucepan over medium heat, combine the balsamic vinegar, maple syrup, minced garlic, and a pinch of salt and pepper.
Bring the mixture to a gentle simmer and allow it to reduce by half, stirring occasionally. This will take about 10-15 minutes.
Once the glaze has thickened and coats the back of a spoon, remove it from heat and stir in the butter until it's fully melted and incorporated into the sauce. Set aside.
Once the Brussels sprouts are roasted to your desired level of crispiness, remove them from the oven.
Drizzle the warm balsamic maple glaze over the roasted Brussels sprouts, tossing gently to ensure they are evenly coated with the glaze.
Transfer the glazed Brussels sprouts to a serving dish and garnish with a little extra salt and pepper, if desired.