Preheat your oven to 400°F and line a large sheet pan with parchment paper for easy cleanup.
Pat the chicken breast completely dry with a paper towel to ensure the skin gets a beautiful golden-brown sear.
In a small mixing bowl, whisk together the extra virgin olive oil, lemon juice, lemon zest, rosemary, garlic powder, sea salt, and black pepper.
Trim the ends of the Brussels sprouts and slice them in half, then peel and slice the carrots into half-inch rounds.
Place the chicken breast and the prepared vegetables onto the sheet pan, ensuring they are spread out in a single layer.
Drizzle the lemon-herb oil mixture over everything and use your hands or tongs to toss until the chicken and vegetables are thoroughly coated.
Roast in the center of the oven for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F.
Remove from the oven and let the chicken rest for 5 minutes before slicing to lock in the juices before serving.