01 - Set the oven to 425°F and line a baking sheet with parchment paper.
02 - In a large bowl, toss halved Brussels sprouts with olive oil, sea salt, black pepper, and garlic powder if desired until evenly coated.
03 - Spread the Brussels sprouts in a single layer, cut side down, on the prepared baking sheet to enhance browning.
04 - Roast for 20 to 25 minutes, flipping halfway through, until edges are golden brown and crispy.
05 - Remove from oven and, if desired, drizzle with balsamic vinegar. Toss gently and serve immediately.