Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper.
Slice the sweet potato into thin, even wedges and trim the woody ends off the asparagus spears.
In a small mixing bowl, whisk together the olive oil, lemon juice, lemon zest, dried oregano, garlic powder, sea salt, and black pepper.
Place the chicken breast, sweet potato wedges, and asparagus on the prepared sheet pan in a single layer.
Drizzle the lemon-herb oil mixture over the chicken and vegetables, tossing them gently to ensure everything is well-coated.
Roast in the oven for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the sweet potatoes are tender.
Remove from the oven and sprinkle with freshly chopped parsley before serving.