Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Peel the sweet potato and cut it into uniform 1/2-inch cubes to ensure even roasting.
Place the sweet potato cubes on the baking sheet, drizzle with 0.5 tablespoons of olive oil, and sprinkle with half of the salt and pepper.
Toss the potatoes to coat and roast in the oven for 10 minutes while you prepare the chicken.
In a small bowl, combine the remaining olive oil, minced garlic, chopped rosemary, and chopped thyme.
Rub the herb and garlic mixture all over the chicken breast, ensuring it is well-coated for maximum flavor.
Remove the baking sheet from the oven, push the potatoes to one side, and place the chicken breast and trimmed asparagus on the other side.
Season the asparagus with the remaining salt and pepper, then return the pan to the oven for 15 to 20 minutes.
Verify the chicken has reached an internal temperature of 165°F and let it rest for 5 minutes before slicing to keep it juicy.