Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Wash and halve the baby potatoes, and trim the woody ends off the asparagus spears.
In a small mixing bowl, whisk together the extra virgin olive oil, lemon zest, lemon juice, dried oregano, garlic powder, sea salt, and black pepper to create the herb marinade.
Place the chicken breast, halved potatoes, and trimmed asparagus onto the prepared baking sheet.
Drizzle the lemon-herb oil over the chicken and vegetables, using your hands or a brush to ensure everything is evenly coated.
Arrange the ingredients in a single layer, ensuring the chicken is not covered by vegetables to allow the skin to crisp up.
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 fork-tender and golden brown.
Let the chicken rest for 5 minutes before slicing to keep it juicy, then serve alongside the roasted vegetables.