Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Dice the Yukon Gold potato into 1/2-inch cubes to ensure they roast quickly and evenly.
In a small bowl, whisk together the olive oil, minced garlic, rosemary, thyme, sea salt, pepper, and lemon juice.
Place the potato cubes on one side of the baking sheet and toss with half of the herb oil mixture.
Roast the potatoes for 15 minutes to give them a head start on becoming golden and tender.
While potatoes roast, brush the remaining herb oil over the chicken breast and toss the green beans in any leftover oil.
Carefully remove the baking sheet from the oven, add the chicken breast and green beans to the empty side, and return to the oven.
Roast for an additional 18-22 minutes, or until the chicken reaches an internal temperature of 165°F and the potatoes are crisp.
Remove from the oven and let the chicken rest for 5 minutes before slicing to keep the meat succulent and flavorful.