Preheat oven to 400°F and line a sheet pan with parchment paper.
Dice the potato into half-inch cubes and place them on the pan.
Drizzle the potato with 0.25 tablespoons of olive oil, sea salt, and black pepper.
Roast the potatoes for 10 minutes.
Season the chicken breast with garlic powder, dried oregano, sea salt, and black pepper.
Move potatoes to one side, then add the chicken and asparagus to the pan.
Drizzle the remaining olive oil, lemon juice, and lemon zest over the chicken and asparagus.
Roast for 15 to 18 minutes until the chicken is cooked through and the asparagus is tender.