Preheat your oven to 400°F and line a large sheet pan with parchment paper for easy cleanup.
Mince the garlic and finely chop the fresh rosemary and thyme leaves.
In a small bowl, whisk together the extra virgin olive oil, minced garlic, rosemary, thyme, sea salt, and black pepper to create the marinade.
Place the chicken breast on one side of the sheet pan and brush thoroughly with half of the herb oil mixture.
Trim the woody ends off the asparagus spears and arrange them in a single layer on the other side of the pan.
Drizzle the remaining herb oil over the asparagus and toss with your hands to ensure every spear is evenly coated.
Slice the lemon half into thin rounds and place them directly on top of the chicken and asparagus for infused flavor.
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 asparagus is tender.
Remove from the oven and let the chicken rest for 5 minutes before slicing to keep the meat juicy and flavorful.