Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Slice the chicken breast into 1-inch bite-sized pieces and chop the zucchini, broccoli, and bell pepper into uniform chunks to ensure even cooking.
In a small bowl, whisk together the extra virgin olive oil, fresh lemon juice, dried oregano, garlic powder, sea salt, and black pepper.
Place the chicken pieces and chopped vegetables onto the prepared sheet pan and drizzle the lemon-herb mixture over the top.
Toss everything together with your hands or tongs until the chicken and vegetables are evenly coated, then spread them out into a single layer.
Roast in the oven for 18 to 22 minutes, or until the chicken is cooked through and the vegetables are tender-crisp.
Remove from the oven and let rest for a few minutes before serving or portioning into airtight containers for your weekly meal prep.