Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Mince the garlic cloves and finely chop the fresh rosemary and thyme.
Wash the sweet potato and cut it into 1/2-inch cubes, then place them on one side of the baking sheet.
Add the broccoli florets to the baking sheet and drizzle the vegetables with half of the olive oil, a pinch of salt, and a pinch of pepper.
Pat the chicken breast dry and rub it with the remaining olive oil, minced garlic, chopped herbs, salt, and pepper.
Place the seasoned chicken breast on the other side of the baking sheet, ensuring it is not crowded by the vegetables.
Roast in the oven for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the sweet potatoes are tender and lightly browned.
Let the chicken rest for 5 minutes before slicing to keep it juicy, then serve alongside the roasted vegetables.