Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
In a small bowl, whisk together the extra virgin olive oil, lemon juice, lemon zest, minced garlic, dried oregano, sea salt, and black pepper to create the zesty marinade.
Peel and dice the sweet potato into 1-inch cubes, then place them on one side of the sheet pan and toss with half of the prepared marinade.
Place the chicken breast on the other side of the pan and brush thoroughly with the remaining marinade.
Roast the chicken and sweet potatoes in the oven for 15 minutes.
Remove the pan briefly to add the trimmed asparagus spears to the center, tossing them in the juices on the pan.
Return the pan to the oven and roast for an additional 10-12 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender.
Allow the chicken to rest for 5 minutes before slicing to ensure it stays juicy.