Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper.
Halve the baby gold potatoes and place them on the sheet pan, tossing with 0.5 tbsp of olive oil and a portion of the sea salt and black pepper.
Roast the potatoes for 10 minutes to give them a head start.
While the potatoes roast, whisk together the remaining 0.5 tbsp olive oil, lemon juice, lemon zest, minced garlic, and dried oregano in a small bowl.
Remove the pan from the oven and move the potatoes to one side. Place the chicken breast and trimmed asparagus spears on the empty side.
Drizzle the lemon-herb mixture over the chicken and asparagus, then season everything with the remaining sea salt and black pepper.
Return the pan to the oven and roast for 15-20 minutes, or until the chicken reaches an internal temperature of 165°F and the asparagus is tender-crisp.
Let the chicken rest for 5 minutes before slicing to ensure it stays juicy, then serve alongside the roasted vegetables.