01 - Preheat oven to 425°F. Line a baking sheet with parchment paper.
02 - Place halved Brussels sprouts in a large bowl. Drizzle with olive oil, then add sea salt, black pepper, and optional seasonings. Toss thoroughly to coat.
03 - Spread the sprouts cut-side down in a single layer on the prepared baking sheet.
04 - Roast for 20 to 25 minutes, flipping halfway through, until edges are golden brown and crisp.
05 - Remove from oven. Sprinkle with Parmesan, parsley, and lemon zest if desired. Serve immediately.