Preheat your oven to 400°F (200°C).
Pat the chicken breast dry with paper towels. Season both sides generously with salt, pepper, and mixed dried herbs.
Place the chicken breast on a lightly greased baking tray. Bake for 20-25 minutes or until cooked through and the skin is crispy.
Meanwhile, peel (if desired) and cut the sweet potato into 1-inch cubes. In a bowl, toss the sweet potato cubes with olive oil, salt, pepper, and a pinch of the mixed dried herbs.
Spread the sweet potato cubes in a single layer on another baking sheet.
Trim the ends of the green beans. Toss them lightly with a small drizzle of olive oil, salt, and pepper.
Add the green beans to the baking sheet with the sweet potatoes if space allows, or use a separate tray, and roast them together for about 20 minutes or until the sweet potatoes are tender and the green beans are crisp-tender.
Once the chicken is done, allow it to rest for a few minutes before slicing. Plate the sliced chicken alongside the roasted sweet potatoes and green beans.
Serve immediately and enjoy your balanced, savory meal.