Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Peel and dice the sweet potato into 1/2-inch cubes and trim the woody ends off the asparagus spears.
Finely mince the fresh rosemary, thyme, and garlic clove.
In a large mixing bowl, whisk together the olive oil, juice from the lemon half, minced garlic, rosemary, thyme, sea salt, and black pepper.
Add the chicken breast, sweet potato cubes, and asparagus to the bowl, tossing thoroughly until every piece is evenly coated in the herb oil.
Spread the ingredients in a single layer on the prepared baking sheet, ensuring the chicken has enough space to allow the skin to crisp.
Roast for 20-25 minutes, or until the chicken reaches an internal temperature of 165°F and the sweet potatoes are fork-tender with golden edges.
Remove from the oven and let the chicken rest for 5 minutes before slicing to ensure the meat remains juicy.