Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper.
Wash and halve the baby potatoes, and trim the tough, woody ends off the asparagus spears.
In a small mixing bowl, whisk together the extra virgin olive oil, lemon juice, lemon zest, dried oregano, garlic powder, sea salt, and black pepper.
Place the chicken breast, halved potatoes, and trimmed asparagus onto the prepared sheet pan in a single layer.
Drizzle the lemon-herb oil mixture over the chicken and vegetables, using your hands or tongs to toss everything until thoroughly and 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 fork-tender.
Remove from the oven and let the chicken rest for 5 minutes before slicing to ensure it stays juicy.
Plate the sliced chicken alongside the roasted vegetables and drizzle any remaining pan juices over the top before serving.