Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper.
Slice the chicken breast into 1-inch bite-sized pieces and chop the zucchini into half-moons.
In a large bowl, toss the chicken, broccoli, zucchini, and cherry tomatoes with olive oil, garlic powder, dried oregano, sea salt, and black pepper.
Spread the mixture in a single layer on the prepared sheet pan, ensuring the chicken pieces are not touching to achieve a crispy texture.
Squeeze the juice of the lemon half over the tray and place the remaining lemon rind on the pan for extra aroma.
Roast for 18-22 minutes, or until the chicken is cooked through and the vegetables are tender with slightly charred edges.
Serve immediately, drizzling any concentrated pan juices over the top for maximum flavor.