Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Pat the chicken breast dry with paper towels and trim the woody ends off the asparagus.
In a small bowl, whisk together the olive oil, minced garlic, dried thyme, dried rosemary, sea salt, and black pepper.
Place the chicken and asparagus on the prepared baking sheet and drizzle with the herb oil mixture, tossing the vegetables to coat.
Squeeze the juice from the lemon half over the chicken and asparagus, then place the spent lemon half on the tray for extra aroma.
Roast in the center of the oven for 20 to 25 minutes until the chicken reaches an internal temperature of 165°F and the asparagus is lightly browned.
Let the chicken rest for 5 minutes before slicing to ensure every bite is juicy and flavorful.