Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper.
Peel and dice the sweet potato into 1/2-inch cubes, and trim the woody ends off the asparagus.
Place the chicken breast on one side of the pan and rub with half of the olive oil, garlic powder, sea salt, and black pepper.
Toss the diced sweet potatoes with the remaining olive oil, rosemary, and thyme on the other side of the pan.
Roast the chicken and sweet potatoes for 15 minutes.
Remove the pan from the oven, add the asparagus to the center, and sprinkle the lemon zest over the chicken.
Return the pan to the oven and roast for another 10-12 minutes until the chicken reaches an internal temperature of 165°F and the potatoes are golden.
Drizzle the fresh lemon juice over the chicken and vegetables before serving hot.