Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Cut the chicken breast into even 1-inch bite-sized pieces to ensure they cook quickly and remain juicy.
In a large mixing bowl, whisk together the extra virgin olive oil, fresh lemon juice, dried oregano, garlic powder, sea salt, and black pepper.
Add the chicken pieces, broccoli florets, and sliced red bell peppers to the bowl, tossing thoroughly until everything is evenly coated in the marinade.
Spread the mixture in a single layer on the prepared baking sheet, ensuring the ingredients aren't crowded so they roast rather than steam.
Bake for 18 to 22 minutes, or until the chicken is cooked through and the vegetables are tender with slightly charred edges.
Remove from the oven and let rest for 2 minutes before serving to allow the juices to redistribute.