Add finely chopped garlic and rosemary into olive oil. Let it sit for an hour or so.
Remove the over layer of the Brussels sprouts and cut them in halves (or quarters if large). Add half of the garlic, rosemary infused olive oil, salt and fresh cracked black pepper. Toss them well.
Place them on a baking sheet lined with aluminum foil and bake them at 170°C for 12-15 mins.
Remove them from the oven, add remaining olive oil along with the garlic and rosemary. Toss them again.
Place them again on the baking tray and bake again for another 10-15 mins, turning them occasionally.
Once they are golden brown and caramelized on the edges, remove them from the oven.