Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Peel and dice the sweet potato into small 1/2-inch cubes and chop the broccoli into 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 breast, sweet potato cubes, and broccoli florets on the prepared baking sheet.
Drizzle the garlic-herb oil mixture over the chicken and vegetables, using your hands or a brush 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 vegetables are tender and lightly browned.
Remove from the oven and drizzle the fresh lemon juice over the chicken and broccoli to brighten the flavors.
Let the chicken rest for 5 minutes before slicing to keep it juicy, then serve alongside the roasted vegetables.