Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Peel and dice the sweet potato into 1/2-inch cubes, and cut the broccoli into bite-sized florets.
Finely mince the garlic cloves and roughly chop the fresh rosemary and thyme leaves.
In a small mixing bowl, whisk together the extra virgin olive oil, minced garlic, rosemary, thyme, sea salt, and black pepper.
Place the chicken breast, diced sweet potatoes, and broccoli florets onto the prepared baking sheet.
Drizzle the herb oil mixture over the chicken and vegetables, using your hands or a spatula to ensure everything is 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 potatoes are golden and tender.
Remove from the oven and squeeze the fresh lemon juice over the entire tray before serving to brighten the flavors.