Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper.
Halve the baby potatoes and cut the broccoli into bite-sized florets.
In a small bowl, whisk together the extra virgin olive oil, lemon juice, lemon zest, minced fresh rosemary, garlic powder, sea salt, and black pepper.
Place the chicken breast on one side of the sheet pan and arrange the potatoes and broccoli on the other side.
Drizzle the lemon-herb oil mixture over the chicken and vegetables, using your hands or a brush to ensure everything is evenly coated.
Roast in the oven for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the potatoes are fork-tender.
Switch the oven to broil for the final 2 to 3 minutes to achieve a golden, crispy finish on the chicken skin and vegetables.
Remove from the oven and let the chicken rest for 5 minutes before slicing and serving.