Preheat the oven to 400℉. Line a rimmed baking sheet with parchment paper.
Trim the brussels sprouts by cutting on the tough ends and discarding, and then cut them in half. Place all of the trimmed brussels sprouts in a bowl.
Drizzle olive oil on top of the brussels. Toss to coat. Spread the brussels onto the parchment-lined baking sheet in an even layer. Sprinkle kosher salt generously on top. Add a few grinds of freshly ground pepper too.
Roast the brussels sprouts for 30 to 40 minutes (stirring a couple of times while roasting) until they are lightly browned (some will be browned more than others).
Transfer the roasted brussels sprouts to a platter. Drizzle with balsamic glaze, if desired.