Preheat oven to 400°F (200°C) and line a large sheet pan with parchment paper.
In a small bowl, whisk together the olive oil, lemon juice, lemon zest, minced garlic, dried thyme, dried rosemary, sea salt, and black pepper.
Place the chicken breast, broccoli florets, sliced carrots, and halved baby potatoes onto the prepared sheet pan.
Pour the lemon-herb marinade over the chicken and vegetables, tossing thoroughly to ensure everything is well-coated.
Spread the ingredients into a single layer, ensuring the chicken pieces are not crowded by the vegetables.
Roast for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and lightly browned.