Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Mince the garlic clove and finely chop the fresh rosemary and thyme leaves.
Pat the chicken breast completely dry with a paper towel to ensure the skin and surface roast to a crisp texture.
In a small bowl, whisk together 0.5 tbsp of olive oil, the minced garlic, chopped rosemary, thyme, sea salt, and black pepper.
Rub the herb and oil mixture evenly over all sides of the chicken breast, then zest half of the lemon directly over the top.
Trim the woody ends off the asparagus and toss the spears with the remaining 0.5 tbsp of olive oil and a small pinch of salt.
Place the seasoned chicken breast and the asparagus spears onto the prepared baking sheet in a single layer.
Roast for 18 to 22 minutes, or until the chicken reaches an internal temperature of 165°F and the asparagus is tender.
Remove from the oven and squeeze the juice from the lemon half over both the chicken and the roasted asparagus.
Slice the chicken breast and serve it alongside the asparagus over a bed of warm, fluffy cooked brown rice.