Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Trim the woody ends off the asparagus and slice the carrots into thin rounds.
In a small bowl, whisk together the olive oil, lemon juice, minced garlic, dried rosemary, sea salt, and black pepper.
Place the chicken breast, asparagus, and carrots on the prepared baking sheet in a single layer.
Drizzle the lemon-herb oil mixture over the chicken and vegetables, using your hands or a brush to ensure everything is evenly coated.
Roast for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and slightly browned.
Remove from the oven and let the chicken rest for 5 minutes before slicing to keep the meat succulent.