Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Wash and dice the potato into 1-inch cubes, ensuring they are uniform for even cooking.
In a medium bowl, toss the potato cubes with half of the olive oil, rosemary, 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 roast, rub the chicken breast with the remaining olive oil, garlic powder, and any leftover herbs.
Carefully remove the baking sheet from the oven, flip the potatoes, and place the chicken breast on the other side.
Return the sheet to the oven and roast for an additional 18 to 22 minutes, or until the chicken reaches an internal temperature of 165°F.
Let the chicken rest for 5 minutes before slicing to keep it juicy, then serve alongside the roasted potatoes.