Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Mince the garlic cloves and finely chop the fresh rosemary and thyme leaves.
In a small bowl, whisk together half of the olive oil with the minced garlic, chopped herbs, sea salt, and black pepper.
Pat the chicken breast dry with a paper towel and rub the herb oil mixture evenly over all sides.
Trim the tough, woody ends off the asparagus spears and toss them in a bowl with the remaining olive oil and a pinch of salt.
Place the seasoned chicken on the prepared baking sheet and roast for 10 minutes.
Carefully remove the pan from the oven, arrange the asparagus spears in a single layer around the chicken, and return to the oven.
Roast for another 12-15 minutes, or until the chicken reaches an internal temperature of 165°F and the asparagus is tender-crisp.
Remove from the oven and immediately squeeze the fresh lemon juice over the chicken and vegetables before serving.