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 1-inch bite-sized pieces and chop the broccoli, bell peppers, and zucchini into uniform sizes to ensure even cooking.
In a small glass bowl, whisk together the extra virgin olive oil, fresh lemon juice, lemon zest, minced garlic, dried oregano, sea salt, and black pepper.
Place the chicken and chopped vegetables onto the prepared sheet pan and pour the lemon-herb dressing over the top, tossing thoroughly with your hands to coat every piece.
Spread the mixture out into a single layer, making sure not to overcrowd the pan so the vegetables roast rather than steam.
Roast for 18 to 22 minutes, or until the chicken is cooked through and the vegetables are tender-crisp with slightly caramelized edges.
Remove from the oven and serve immediately, perhaps with an extra squeeze of fresh lemon if desired.