Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Wash and dice the yellow potato into uniform 1/2-inch cubes to ensure even roasting.
In a small bowl, mince the garlic and combine it with the dried rosemary, dried thyme, sea salt, and black pepper.
Place the diced potatoes on one side of the baking sheet, drizzle with half of the olive oil, and sprinkle with half of the herb mixture.
Toss the potatoes to coat thoroughly and spread them out in a single layer.
Roast the potatoes for 10 minutes while you prepare the chicken.
Pat the chicken breast dry with a paper towel, then rub with the remaining olive oil and herb mixture.
Carefully remove the baking sheet from the oven, move the potatoes to one side, and place the chicken breast on the other side.
Return the pan to the oven and roast for 18 to 22 minutes, or until the chicken reaches an internal temperature of 165°F and the potatoes are golden-brown.
While the chicken and potatoes finish, steam the green peas in a small amount of water until tender and bright green.
Let the chicken rest for 5 minutes before slicing it against the grain.
Plate the sliced chicken alongside the roasted potatoes and steamed peas, serving immediately while hot.