Preheat the oven to 400°F. Line a baking dish with parchment paper.
Clean and trim the Brussels sprouts, and cut them in half lengthwise. Dry them off with a paper towel and place them in the lined baking dish (or an oven-safe skillet).
To a bowl, add garlic, parmesan cheese, salt, pepper, and olive oil, mixing to combine. Pour the oil mixture over the Brussels sprouts, tossing them to coat.
Bake uncovered, approximately 18-25 minutes*, or until crisp on the outside and tender on the inside.