01 - Set the oven to 425°F and line a baking sheet with parchment paper.
02 - In a large bowl, toss the halved Brussels sprouts with olive oil, sea salt, black pepper, and optional seasonings until evenly coated.
03 - Place the sprouts cut-side down in a single layer on the prepared baking sheet.
04 - Roast for 20 to 25 minutes, turning halfway through, until edges are golden brown and crisp.
05 - Remove from oven, then sprinkle with Parmesan, parsley, and lemon zest if desired. Serve immediately.