Preheat your oven to 400°F (200°C).
Chop the red bell pepper, zucchini, and red onion into uniform bite-sized pieces.
Place the vegetables on a baking sheet, drizzle with 1 teaspoon of olive oil, and season with half of the salt, pepper, and dried oregano.
Roast the vegetables for 15 to 20 minutes until they are tender and show slight charred edges.
While vegetables roast, season the chicken breast with the remaining salt and pepper.
Sauté the chicken in a pan over medium heat until cooked through, reaching an internal temperature of 165°F.
Let the chicken rest for 5 minutes before dicing it into small cubes.
In a large mixing bowl, combine the cooked quinoa, roasted vegetables, and diced chicken.
Whisk together the remaining 1 teaspoon of olive oil, lemon juice, and the rest of the dried oregano in a small jar.
Pour the dressing over the salad, add the fresh parsley, and toss everything together until well combined.