Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Cut the chicken breast into 1-inch bite-sized pieces to ensure quick and even roasting.
Chop the broccoli into small florets, the bell pepper into 1-inch squares, and slice the zucchini into half-moons.
In a large mixing bowl, combine the chicken pieces and all the prepared vegetables.
Drizzle the olive oil and lemon juice over the mixture, then sprinkle with lemon zest, oregano, garlic powder, sea salt, and black pepper.
Toss everything thoroughly until the chicken and vegetables are well-coated with the oil and seasonings.
Spread the mixture in a single, even layer on the prepared baking sheet, ensuring the pieces aren't too crowded.
Roast for 18 to 22 minutes, or until the chicken is cooked through and the vegetables are tender with slightly caramelized edges.
Remove from the oven and serve immediately while hot and fragrant.