Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper.
Finely mince the garlic cloves, fresh rosemary, and fresh thyme.
Place the chicken breast, trimmed asparagus, and baby carrots onto the prepared sheet pan in a single layer.
Drizzle the olive oil evenly over the chicken and the vegetables.
Sprinkle the minced garlic, rosemary, thyme, sea salt, and black pepper over everything, tossing the vegetables slightly to coat.
Slice half of the lemon into thin rounds and place them on top of the chicken; squeeze the juice from the remaining half over the entire pan.
Roast in the center of the oven for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are fork-tender.
Let the chicken rest for 5 minutes before serving to ensure it stays juicy.