Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Cut the chicken breast, red bell pepper, and zucchini into uniform bite-sized pieces.
In a large mixing bowl, combine the chicken, broccoli, peppers, and zucchini.
Whisk together the olive oil, lemon juice, dried oregano, garlic powder, sea salt, and black pepper in a small jar.
Pour the dressing over the chicken and vegetables, tossing thoroughly to ensure everything is evenly coated.
Spread the mixture in a single layer on the prepared baking sheet.
Roast for 20 to 25 minutes, or until the chicken is cooked through and the vegetables are tender with slightly browned edges.
Portion the cooked quinoa into meal prep containers and top with the roasted chicken and vegetable mixture.
Garnish with crumbled feta cheese before serving or storing.