Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Cut the chicken breast into 1-inch bite-sized pieces to ensure they cook evenly and stay juicy.
In a large mixing bowl, whisk together the extra virgin olive oil, fresh lemon juice, dried oregano, garlic powder, sea salt, and black pepper.
Add the chicken pieces, broccoli florets, sliced carrots, and chopped zucchini to the bowl, tossing thoroughly until every piece is well-coated in the herb marinade.
Spread the mixture in a single layer on the prepared baking sheet, making sure not to overcrowd the pan so the vegetables roast instead of steam.
Roast for 18 to 22 minutes, or until the chicken is cooked through and the vegetables have slightly caramelized edges.
Remove from the oven and let the dish rest for 5 minutes before serving half for dinner and storing the remaining half in an airtight container for tomorrow's lunch.