Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Wash and peel the sweet potato, then dice it into uniform 1/2-inch cubes for even roasting.
Finely mince the garlic cloves, fresh rosemary, and fresh thyme.
In a small bowl, whisk together the olive oil, minced garlic, rosemary, thyme, sea salt, and black pepper.
Place the chicken breast on one side of the baking sheet and the diced sweet potatoes on the other.
Drizzle the herb oil mixture over both the chicken and the sweet potatoes, tossing the potatoes to coat thoroughly.
Slice the half lemon into thin rounds and layer them directly on top of the chicken breast.
Roast in the center of the oven for 15 minutes.
Remove the pan briefly to add the broccoli florets, tossing them in the natural roasting juices on the pan.
Return to the oven for another 10-12 minutes until the chicken reaches an internal temperature of 165°F and the sweet potatoes are golden.
Let the chicken rest for 5 minutes before slicing to ensure maximum tenderness.