Preheat your oven to 425°F (220°C) and line a large baking sheet with parchment paper.
Wash and dice the sweet potato into 1/2-inch cubes, and trim the woody ends off the asparagus.
Pat the chicken breast completely dry with a paper towel to ensure the skin or surface gets extra crispy.
Finely mince the garlic, rosemary, and thyme, and zest the half lemon into a small bowl.
In a mixing bowl, toss the sweet potato cubes with 0.25 tablespoon of olive oil and a pinch of salt and pepper.
Rub the chicken breast with 0.25 tablespoon of olive oil, the minced herb and garlic mixture, lemon zest, salt, and pepper.
Arrange the chicken and sweet potatoes on the prepared baking sheet, ensuring they are in a single layer.
Roast in the oven for 15 minutes.
While roasting, toss the asparagus with the remaining 0.25 tablespoon of olive oil.
Add the asparagus to the baking sheet and roast everything for an additional 10-12 minutes until the chicken reaches an internal temperature of 165°F.
Remove from the oven and squeeze the fresh lemon juice over the chicken and vegetables before serving.