Preheat your oven to 400°F and line a large sheet pan with parchment paper for easy cleanup.
Scrub the Yukon Gold potato and dice it into uniform half-inch cubes to ensure even roasting.
Trim the ends off the fresh green beans and set them aside.
In a small bowl, whisk together the extra virgin olive oil, minced garlic, dried rosemary, sea salt, and black pepper.
Place the diced potatoes on one side of the sheet pan, drizzle with half of the herb oil mixture, and toss to coat.
Roast the potatoes for 15 minutes to give them a head start on getting crispy.
While potatoes roast, pat the chicken breast dry and brush with the remaining herb oil mixture.
Remove the pan from the oven, place the chicken and green beans on the other side, and squeeze the fresh lemon juice over the entire tray.
Return the pan to the oven and roast for an additional 18-20 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 golden potatoes and beans.