Preheat your oven to 400°F and line a large sheet pan 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 the olive oil, the zest and juice of half the lemon, minced garlic, rosemary, thyme, salt, and pepper.
Place the chicken breast on one side of the sheet pan and the trimmed asparagus on the other side.
Drizzle the herb oil mixture over both the chicken and the asparagus, using your hands or a brush to ensure the chicken is fully coated and the asparagus is tossed well.
Slice the remaining half of the lemon into thin rounds and layer them over the chicken and asparagus stalks.
Roast in the oven for 20-25 minutes, or until the chicken reaches an internal temperature of 165°F and the asparagus is vibrant and tender.
Remove from the oven and let the chicken rest for 5 minutes before slicing to keep it juicy and flavorful.