Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Wash and cube the Yukon Gold potato into 1/2-inch pieces, ensuring they are uniform for even cooking.
In a bowl, toss the potato cubes with half of the olive oil, a pinch of sea salt, and a pinch of black pepper, then spread them in a single layer on the baking sheet.
Roast the potatoes for 15 minutes to give them a head start on becoming crispy.
While the potatoes roast, cut the chicken breast into bite-sized pieces and season with dried oregano, garlic powder, and the remaining salt and pepper.
Remove the baking sheet from the oven and add the seasoned chicken and trimmed asparagus spears to the pan.
Drizzle the remaining olive oil and fresh lemon juice over the chicken and asparagus, tossing gently to combine everything on the sheet.
Return the pan to the oven and bake for an additional 15 to 18 minutes, or until the chicken is cooked through and the potatoes are golden brown.
Garnish with freshly chopped parsley before serving hot.