Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Pat the chicken breast completely dry with paper towels to ensure a golden-brown sear during roasting.
In a small bowl, whisk together the olive oil, minced garlic, dried rosemary, dried thyme, sea salt, and black pepper.
Place the chicken breast and trimmed asparagus spears on the prepared baking sheet, ensuring they are in a single layer.
Brush the herb-oil mixture generously over both sides of the chicken and toss the asparagus to coat thoroughly.
Slice half of the lemon into thin rounds and place them on top of the chicken and asparagus; reserve the other half.
Roast in 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 squeeze the remaining lemon half over the dish before serving warm.