Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
In a small mixing bowl, whisk together the extra virgin olive oil, lemon juice, lemon zest, minced garlic, dried oregano, sea salt, and black pepper to create the marinade.
Place the chicken breast, sliced zucchini, and chopped bell peppers on the prepared baking sheet.
Drizzle the lemon-herb marinade over the chicken and vegetables, using your hands or tongs to toss until everything is thoroughly and evenly coated.
Roast in the center of the oven for 18 to 22 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender-crisp with slightly browned edges.
Remove from the oven and let the chicken rest for 5 minutes before slicing it into thin strips to maintain juiciness.
To assemble, portion the warm cooked quinoa into a bowl, top with the roasted vegetables and the sliced chicken breast.
Garnish with fresh chopped parsley and an optional extra squeeze of lemon juice before serving.