Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper.
Halve the baby potatoes and trim the tough, woody ends off the asparagus spears.
In a small glass 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 and halved baby potatoes on the prepared sheet pan.
Drizzle two-thirds of the lemon-herb dressing over the chicken and potatoes, tossing well to ensure everything is evenly coated.
Roast in the oven for 15 minutes.
Remove the pan from the oven, add the asparagus spears to the empty space, and drizzle them with the remaining lemon-herb dressing.
Return the pan to the oven and roast for an additional 10 to 12 minutes, or until the chicken reaches an internal temperature of 165°F and the potatoes are golden.
Let the chicken rest for 5 minutes before slicing to keep it juicy and tender.