Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Cut the chicken breast into 1-inch bite-sized pieces and place them in a large mixing bowl.
Chop the broccoli into small florets, slice the zucchini into half-moons, and dice the red bell pepper into 1-inch squares.
Add the vegetables to the bowl with the chicken pieces.
In a small jar or bowl, whisk together the extra virgin olive oil, lemon juice, lemon zest, oregano, garlic powder, sea salt, and black pepper.
Pour the lemon-herb dressing over the chicken and vegetables, tossing thoroughly to ensure every piece is evenly coated.
Spread the mixture in a single layer on the prepared sheet pan, ensuring nothing is overcrowded to allow for proper browning.
Roast for 18-22 minutes, or until the chicken is cooked through and the vegetables are tender-crisp with slightly charred edges.
Divide onto two plates and serve immediately while hot.