Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper.
Peel and cube the sweet potato into half-inch pieces, slice the carrots into rounds, and chop the broccoli and bell pepper into bite-sized florets and squares.
In a small bowl, whisk together the extra virgin olive oil, minced garlic, dried rosemary, dried thyme, sea salt, and black pepper.
Place the chicken breast and all the chopped vegetables into a large mixing bowl and pour the herb oil over them, tossing thoroughly to ensure an even coating.
Spread the chicken and vegetables in a single layer on the prepared baking sheet, ensuring they are not overcrowded to allow for proper roasting.
Roast in the center of the oven for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are golden and tender.
Remove from the oven and let the chicken rest for 5 minutes before slicing it against the grain and serving it with the roasted vegetable medley.