Preheat your oven to 400°F.
In a small bowl, combine lemon juice, olive oil, chopped fresh herbs, salt, and pepper.
Place the chicken breast on a lined baking sheet and coat it with half of the lemon herb mixture. Let it marinate for 10 minutes.
Arrange the chopped broccoli, red bell pepper slices, and carrot slices on another baking sheet. Drizzle the remaining mixture over the vegetables, and toss to ensure even coating.
Place both the chicken and vegetables in the oven. Roast the chicken for about 20-25 minutes or until fully cooked, and roast the vegetables for 15-20 minutes until tender and slightly caramelized.
While the chicken and vegetables are roasting, prepare quinoa if not pre-cooked.
Plate a serving of cooked quinoa, top with sliced chicken, and add a generous portion of roasted vegetables on the side.
Serve warm and enjoy your balanced, nutritious meal.