Preheat the oven to 400°F (200°C).
In a small bowl, combine the zest and juice of half a lemon with chopped fresh herbs, salt, and pepper.
Pat the chicken breast dry and rub the lemon herb mixture evenly over the chicken.
Place the chicken breast on a baking tray lined with parchment paper.
In a mixing bowl, toss broccoli, carrots, and bell pepper with olive oil, a pinch of salt, and pepper.
Spread the vegetables around the chicken on the baking tray.
Roast the chicken and vegetables in the preheated oven for about 20-25 minutes or until the chicken reaches an internal temperature of 165°F (74°C) and the vegetables are tender with lightly crispy edges.
While the chicken and vegetables are roasting, prepare the quinoa according to package instructions.
To serve, place the cooked quinoa on a plate, slice the roasted chicken, and top with the roasted vegetables.
Enjoy your deliciously balanced meal!