Preheat your oven to 400°F (200°C) and line a large rimmed sheet pan with parchment paper for easy cleanup.
Cut the chicken breast into uniform 1-inch cubes to ensure even cooking and place them in a large mixing bowl.
Chop the broccoli into small florets, slice the bell pepper into strips, and cut the zucchini into half-moons.
In a small jar or bowl, whisk together the extra virgin olive oil, lemon juice, dried oregano, garlic powder, sea salt, and black pepper.
Pour the lemon-herb dressing over the chicken and vegetables in the large bowl and toss thoroughly until everything is well-coated.
Spread the mixture onto the prepared sheet pan in a single layer, ensuring the pieces are not overcrowded so they roast rather than steam.
Roast for 20 to 25 minutes, or until the chicken reaches an internal temperature of 165°F and the vegetables are tender with caramelized edges.
Divide into meal prep containers and allow to cool slightly before sealing and refrigerating for up to four days.