Preheat your oven to 400°F (200°C) and line a baking sheet with parchment paper.
Pat the chicken breast dry with a paper towel and place it on one side of the prepared baking sheet.
Trim the woody ends off the asparagus spears and place them on the other side of the baking sheet.
In a small bowl, whisk together the olive oil, minced garlic, dried rosemary, dried thyme, sea salt, and black pepper.
Drizzle the oil and herb mixture over both the chicken and the asparagus, tossing the asparagus to ensure even coating.
Thinly slice the half lemon and place the rounds directly on top of the chicken breast.
Roast in the oven for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the asparagus is tender.
Let the chicken rest for 5 minutes before slicing to keep it juicy, then serve immediately.