01 - Preheat oven to 425°F. Line a large baking sheet with parchment paper.
02 - Bring a large pot of salted water to a boil. Add Brussels sprouts and cook for 8 to 10 minutes until just tender. Drain thoroughly and cool slightly.
03 - Arrange Brussels sprouts on the prepared baking sheet. Flatten each gently with a potato masher or the bottom of a sturdy glass without breaking them apart.
04 - Drizzle olive oil over the sprouts, then sprinkle with sea salt, black pepper, garlic powder, and smoked paprika.
05 - Toss gently to coat and spread in a single layer. Sprinkle grated Parmesan cheese evenly over the sprouts if using.
06 - Roast for 20 to 25 minutes, flipping halfway through, until edges are golden and crispy.
07 - Serve immediately while the sprouts are hot and crispy.