Preheat your oven to 400°F and line a large sheet pan with parchment paper for easy cleanup.
Dice the gold potatoes into uniform 1-inch cubes and trim the woody ends off the asparagus spears.
In a mixing bowl, toss the potato cubes with half of the olive oil, sea salt, black pepper, and dried oregano.
Spread the potatoes in a single layer on the sheet pan and roast for 15 minutes to give them a head start.
While potatoes roast, season the chicken breast with garlic powder, fresh rosemary, and the remaining olive oil.
Remove the pan from the oven and move the potatoes to one side; place the chicken and asparagus on the other side.
Drizzle the fresh lemon juice over the chicken and asparagus to lock in moisture and add brightness.
Return the pan to the oven and roast for an additional 15 to 20 minutes until the chicken reaches an internal temperature of 165°F.
Allow the chicken to rest for 5 minutes before slicing to ensure it stays juicy, then serve alongside the crispy potatoes and asparagus.