Preheat the oven to 400°F.

Line a large baking sheet with parchment paper.

Trim ends from Brussels sprouts and cut in half. If sprouts are very large, cut them into quarters.

Transfer the Brussels sprouts to a large mixing bowl. Drizzle with olive oil and sprinkle with salt and black pepper.

Use a rubber spatula to toss the Brussels sprouts until they are evenly coated, then arrange in an even layer on the baking sheet.

Roast on middle rack of oven for 15 minutes. While the Brussels sprouts roast, finely mince the garlic cloves.

After 15 minutes, open oven and sprinkle the garlic over the Brussels sprouts. Toss lightly with a rubber spatula to distribute the garlic. Continue roasting until the garlic is fragrant and the Brussels sprouts are tender and slightly charred, 8-10 minutes.

Check to see that Brussels sprouts are done. Remove from oven or add time as needed.

Serve immediately.