Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Wash the potato and dice it into small, uniform 1/2-inch cubes to ensure they get perfectly crispy.
Place the potato cubes in a bowl and toss with 0.25 tbsp of olive oil and half of the rosemary, thyme, garlic powder, salt, and pepper.
Spread the potatoes in a single layer on the prepared baking sheet and roast for 15 minutes.
While the potatoes are roasting, brush the chicken breast with the remaining 0.25 tbsp of olive oil and coat with the rest of the herb and spice mixture.
Remove the baking sheet from the oven, toss the potatoes, and place the seasoned chicken breast on the other side of the pan.
Return the pan to the oven and roast for an additional 18-20 minutes until the chicken reaches an internal temperature of 165°F.
While the tray finishes roasting, steam the green beans in a small amount of water for 5 minutes until they are vibrant and tender-crisp.
Plate the herb-crusted chicken alongside the golden potatoes and steamed green beans for a clean, balanced meal.