Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Cut the baby potatoes into halves, slice the carrots into rounds, and break the broccoli into bite-sized florets.
In a small mixing bowl, whisk together the extra virgin olive oil, lemon juice, dried oregano, dried thyme, garlic powder, sea salt, and black pepper.
Place the chicken breast on one side of the baking sheet and arrange the potatoes, carrots, and broccoli on the other side in a single layer.
Drizzle the lemon-herb mixture over both the chicken and the vegetables, using a brush or your hands to ensure every piece is thoroughly 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.
Let the chicken rest for 5 minutes before slicing to keep it juicy, then serve alongside the roasted vegetables.