Preheat oven to 400°F (200°C) and line a large sheet pan with parchment paper.
Cut the chicken breast into 1-inch bite-sized pieces and slice the zucchini and bell pepper into similar sizes.
Place the chicken, broccoli, zucchini, and bell pepper on the prepared sheet pan.
In a small bowl, whisk together the olive oil, lemon juice, oregano, garlic powder, sea salt, and black pepper.
Drizzle the lemon-herb mixture over the chicken and vegetables, tossing well to ensure everything is evenly coated.
Spread the ingredients into a single layer, ensuring they aren't overcrowded to allow for proper browning.
Roast for 18-22 minutes, or until the chicken is cooked through and the vegetables are tender and slightly caramelized.
Remove from the oven and divide into meal prep containers for a healthy, ready-to-go lunch or dinner.