Preheat oven to 400°F (200°C). Line a baking sheet with parchment paper if needed.
In a large bowl, combine half the Parmesan cheese, lemon juice and zest, garlic powder, olive oil, salt, and pepper.
Add the halved Brussels sprouts and toss well to coat.
Place sprouts cut-side down on the prepared baking sheet.
Sprinkle the remaining Parmesan cheese evenly over the top.
Bake for 30–35 minutes, until the Brussels sprouts are tender and the cheese is golden brown and crispy.
Serve hot with your favorite dipping sauce or enjoy them as-is!