Preheat your oven to 400°F and line a large rimmed sheet pan with parchment paper for easy cleanup.
Wash and halve the baby potatoes, and trim the tough, woody ends off the asparagus spears.
Slice the chicken breasts into even 1-inch thick strips to ensure they cook at the same rate as the vegetables.
In a small glass bowl, whisk together the olive oil, lemon juice, lemon zest, dried oregano, garlic powder, sea salt, and black pepper.
Place the halved potatoes on one side of the sheet pan, drizzle with half of the lemon-herb mixture, and toss to coat.
Roast the potatoes alone for 10 minutes to give them a head start on becoming tender.
Remove the pan from the oven and add the chicken strips and asparagus to the empty side; drizzle with the remaining dressing and toss well.
Return the pan to the oven and roast for an additional 12 to 15 minutes, or until the chicken reaches an internal temperature of 165°F and the asparagus is crisp-tender.
Divide the chicken and vegetables between two plates and serve immediately while hot.