Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Wash and peel the sweet potato, then cut it into uniform 1-inch cubes to ensure even cooking.
Trim the ends off the fresh green beans and pat the chicken breast dry with a paper towel.
Place the chicken breast, sweet potato cubes, and green beans onto the prepared baking sheet in a single layer.
Drizzle the extra virgin olive oil over the chicken and vegetables, then sprinkle evenly with rosemary, thyme, garlic powder, sea salt, and black pepper.
Use your hands or tongs to toss the vegetables and rub the chicken until everything is thoroughly coated in the oil and herb mixture.
Roast in the center of the oven for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the sweet potatoes are tender and golden.
Remove from the oven and allow the chicken to rest for 5 minutes before slicing to ensure the juices redistribute for a moist result.