Cut the Brussels sprouts off of the stalk if necessary. Cut off any hard ends, then cut each in half or larger sprouts into thirds. In a bowl, mix them with the olive oil, kosher salt, and fresh ground black pepper. Roast for about 15 minutes until tender and blackened (no need to stir).
When Brussels sprouts are done, mix them with the harissa and top with goat cheese crumbles. Serve warm.