Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Cut the chicken breast into bite-sized 1-inch cubes and slice the red bell pepper into thin strips.
Place the chicken cubes, broccoli florets, and bell pepper strips onto the prepared baking sheet.
Drizzle the extra virgin olive oil over the chicken and vegetables, then sprinkle evenly with sea salt, black pepper, garlic powder, and dried oregano.
Toss everything together with your hands or tongs until the chicken and produce are thoroughly and evenly coated with the oil and spices.
Spread the mixture into a single layer and roast in the oven for 18 to 22 minutes, or until the chicken is cooked through and the vegetables are tender and slightly charred.
Remove from the oven and immediately drizzle the fresh lemon juice over the roasted chicken and vegetables to brighten the flavors.
To assemble for meal prep, divide the cooked quinoa into your storage containers and top with the roasted chicken and vegetable mixture.
Seal the containers and refrigerate for up to 4 days, enjoying cold or reheated for a quick, high-protein meal.