Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper.
Wash and halve the baby potatoes, and trim the woody ends off the asparagus spears.
In a small bowl, whisk together the extra virgin olive oil, minced garlic, dried rosemary, dried thyme, sea salt, black pepper, and the juice from the half lemon.
Place the chicken breast and halved potatoes on the prepared sheet pan and drizzle with two-thirds of the herb oil mixture, tossing to coat thoroughly.
Roast the chicken and potatoes in the oven for 15 minutes.
Remove the pan from the oven, add the asparagus spears to the empty space, and drizzle them with the remaining herb oil.
Return the pan to the oven and roast for an additional 10 to 12 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and golden.
Let the chicken rest for 5 minutes before slicing and serving alongside the roasted vegetables.