Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Peel the sweet potato and cut it into 1/2-inch cubes.
Mince the garlic cloves and finely chop the fresh rosemary and thyme leaves.
In a bowl, toss the sweet potato cubes with 0.5 tbsp of olive oil and a portion of the sea salt and black pepper.
Spread the sweet potatoes on the baking sheet and roast for 10 minutes.
While the potatoes roast, rub the chicken breast with the remaining 0.5 tbsp of olive oil, minced garlic, rosemary, thyme, and the remaining salt and pepper.
Remove the baking sheet from the oven, move the potatoes to one side, and place the chicken breast in the center.
Top the chicken with thin slices of the lemon and return the sheet to the oven for 10 minutes.
Trim the woody ends off the asparagus and add the spears to the baking sheet, tossing them lightly in the pan juices.
Roast for a final 10 to 12 minutes until the chicken reaches an internal temperature of 165°F and the vegetables are tender.
Allow the chicken to rest for 5 minutes before slicing to ensure it remains juicy and flavorful.