Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Pat the chicken breast dry with a paper towel and slice it into even 1-inch strips to ensure uniform cooking.
In a large mixing bowl, whisk together the extra virgin olive oil, lemon juice, minced garlic, dried oregano, sea salt, and black pepper.
Add the chicken strips, broccoli florets, chopped bell pepper, and sliced zucchini to the bowl, tossing thoroughly until every piece is coated in the marinade.
Spread the chicken and vegetables in a single layer on the prepared baking sheet, making sure not to overcrowd the pan so the vegetables roast rather than steam.
Place the tray in the oven and 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, drizzling any flavorful juices from the pan back over the chicken.