Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Pat the chicken breast completely dry with a paper towel to ensure the skin or surface achieves a perfect golden crisp.
In a small mixing bowl, whisk together the olive oil, minced rosemary, thyme, garlic powder, sea salt, and black pepper.
Place the chicken breast, broccoli florets, and sliced carrots onto the prepared baking sheet in a single layer.
Drizzle the herb-oil mixture over the chicken and vegetables, using your hands or a brush to coat every piece thoroughly.
Slice half of the lemon into thin rounds and place them directly on top of the chicken; set the other half aside.
Roast in the center of the oven for 20-25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender-crisp.
Remove from the oven and squeeze the remaining lemon half over the entire tray before serving to brighten all the flavors.