Preheat your oven to 400°F (200°C) and line a large rimmed sheet pan with parchment paper for easy cleanup.
Slice the chicken breast into 1-inch bite-sized pieces and cut the zucchini into half-moons.
In a small bowl, whisk together the extra virgin olive oil, lemon juice, lemon zest, minced garlic, dried oregano, sea salt, and black pepper.
Place the chicken pieces, broccoli florets, and zucchini slices onto the prepared sheet pan.
Pour the lemon-herb marinade over the chicken and vegetables, tossing thoroughly with your hands or tongs to ensure every piece is evenly coated.
Spread the mixture out into a single layer, ensuring the chicken pieces are not crowded so they brown properly.
Roast in the oven for 18-22 minutes, or until the chicken is cooked through and the vegetables are tender and slightly caramelized at the edges.
Remove from the oven and let rest for 5 minutes before serving or portioning into meal prep containers.