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 cubes and chop the broccoli, bell pepper, and zucchini into uniform pieces.
Place the chicken and all the chopped vegetables onto the prepared sheet pan.
Drizzle the extra virgin olive oil over the chicken and vegetables.
Squeeze the juice from the half lemon over the ingredients, then sprinkle with dried oregano, garlic powder, sea salt, and black pepper.
Toss everything together with your hands or tongs until the chicken and vegetables are thoroughly and evenly coated with the oil and seasonings.
Spread the mixture out into a single layer, ensuring there is space between pieces so they roast rather than steam.
Roast in the oven for 20 to 25 minutes, or until the chicken is cooked through and the vegetables are tender with slightly charred, crispy edges.