Preheat oven to 400°F (200°C).
In a large bowl, toss the root vegetables with 1 tablespoon of olive oil, salt, and pepper. Spread on a large baking sheet.
Roast the vegetables for 15 minutes.
While the vegetables are roasting, prepare the chicken. In a small bowl, whisk together the remaining 1 tablespoon of olive oil, lemon juice, fresh herbs, and garlic.
Place the chicken breasts on top of the partially roasted vegetables. Brush the chicken with the lemon herb mixture.
Return the baking sheet to the oven and roast for another 20-25 minutes, or until the chicken is cooked through and the vegetables are tender.
Serve hot.