Preheat your oven to 400°F and line a large baking sheet with parchment paper.
Slice the sweet potato into half-inch wedges and trim the woody ends off the asparagus.
Finely mince the garlic, rosemary, and thyme.
In a small bowl, whisk together half of the olive oil, the minced garlic, rosemary, thyme, lemon zest, salt, and pepper.
Rub the herb mixture evenly over the chicken breast until well coated.
Place the chicken, sweet potato wedges, and asparagus on the prepared baking sheet.
Drizzle the remaining olive oil over the vegetables and toss gently to coat.
Roast for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the sweet potatoes are tender.
Squeeze the fresh lemon juice over the chicken and vegetables just before serving.