Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Prepare the vegetables by dicing the sweet potato into 1/2-inch cubes, slicing the carrots into rounds, and cutting the broccoli into bite-sized florets.
Thinly wedge the red onion and mince the garlic clove.
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 on one side of the baking sheet and arrange the sweet potatoes, carrots, broccoli, and red onion on the remaining space.
Drizzle the herb oil mixture over the chicken and the vegetables, using your hands or a spatula to toss the vegetables until they are evenly coated.
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 with golden edges.
Remove from the oven and let the chicken rest for 5 minutes before slicing to ensure it remains juicy and flavorful.