Preheat your oven to 425°F (220°C).
Pat the chicken breast dry with paper towels. Season with salt, pepper, and half of the mixed dried herbs.
Lightly coat the chicken with a small drizzle of olive oil and a squeeze of lemon juice.
Place the chicken breast on a baking sheet lined with parchment paper.
In a separate bowl, toss the trimmed green beans and diced sweet potato with the remaining olive oil, lemon juice, mixed herbs, salt, and pepper.
Spread the vegetables in a single layer on another baking sheet.
Place both baking sheets in the oven. Roast the vegetables for about 20-25 minutes until tender and lightly browned, stirring once midway.
Bake the chicken for about 20-25 minutes until the internal temperature reaches 165°F (74°C) and the exterior crisps up.
Once done, let the chicken rest for a few minutes before slicing. Serve the sliced chicken alongside the roasted green beans and sweet potatoes.
Enjoy your balanced, flavorful meal!