Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper to prevent sticking.
Cut the chicken breast into uniform 1-inch pieces and place them in a large mixing bowl.
Peel and cube the sweet potato into 1/2-inch pieces, slice the carrots into thin rounds, and break the broccoli into small, bite-sized florets.
Add all the prepared vegetables into the bowl with the chicken pieces.
Mince the garlic cloves finely and add them to the bowl along with the extra virgin olive oil, dried rosemary, dried thyme, sea salt, and black pepper.
Toss the ingredients thoroughly until every piece of chicken and vegetable is well-coated in the oil and aromatics.
Spread the mixture across the prepared baking sheet in a single layer, ensuring there is space between pieces so they roast and develop a golden crust rather than steaming.
Roast for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender and slightly caramelized.
Remove from the oven and allow the dish to rest for 2 minutes to lock in the juices before serving.