Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Mince the garlic cloves and cut the sweet potato into 1/2-inch thick wedges.
In a small bowl, whisk together the olive oil, lemon juice, minced garlic, dried rosemary, dried thyme, sea salt, and black pepper to create the marinade.
Place the chicken breast and sweet potato wedges on the prepared sheet pan, then drizzle with half of the lemon-herb oil mixture.
Roast in the center of the oven for 15 minutes.
Remove the pan from the oven, add the asparagus spears to the empty spaces, and drizzle the remaining herb oil over the vegetables.
Return the pan to the oven and roast for an additional 10 to 12 minutes until the chicken reaches an internal temperature of 165°F and the sweet potatoes are fork-tender.
Allow the chicken to rest for 5 minutes before slicing to ensure the juices redistribute for maximum tenderness.