Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Scrub the potato clean and dice it into uniform half-inch cubes to ensure even cooking.
In a medium bowl, toss the potato cubes with half of the olive oil, dried rosemary, dried thyme, sea salt, and black pepper.
Spread the potatoes in a single layer on one side of the prepared baking sheet and roast for 15 minutes.
While the potatoes are roasting, rub the chicken breast with the remaining olive oil, garlic powder, onion powder, and a pinch of salt and pepper.
Carefully remove the baking sheet from the oven, slide the potatoes to one side, and place the chicken breast on the other side.
Return the sheet to the oven and roast for an additional 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the potatoes are fork-tender.
Drizzle the lemon juice over the chicken and potatoes, then garnish with chopped fresh parsley before serving hot.