Preheat oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Cut the chicken breast and sweet potato into 1-inch cubes, ensuring they are similar in size for even cooking.
Chop the red bell pepper into 1-inch pieces and break the broccoli into small, bite-sized florets.
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 and all vegetables in a large mixing bowl and drizzle with the herb oil, tossing well to coat every piece.
Spread the mixture onto the prepared baking sheet in a single layer, making sure not to overcrowd the pan.
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 tender.