Preheat your oven to 400°F (200°C).
In a small bowl, whisk together lemon juice, olive oil, dried oregano, dried thyme, garlic powder, salt, and pepper.
Place the chicken breast on a baking tray and coat it evenly with the lemon-herb mixture.
Chop the broccoli, red bell pepper, and zucchini into bite-sized pieces. Toss them lightly with a small drizzle of olive oil, salt, and pepper.
Arrange the vegetables around the chicken on the baking tray.
Roast in the preheated oven for about 20-25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender.
While the chicken and vegetables are roasting, prepare the quinoa if not already cooked. Use a stovetop or microwave to heat the cooked quinoa.
Plate the roasted chicken alongside the quinoa and roasted vegetables. Enjoy your balanced, flavorful meal!