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 even 1-inch wide strips and chop the zucchini, bell pepper, and red onion into bite-sized pieces.
In a large mixing bowl, whisk together the extra virgin olive oil, lemon juice, lemon zest, oregano, garlic powder, sea salt, and black pepper.
Add the chicken and chopped vegetables to the bowl, tossing thoroughly until every piece is well-coated in the herb marinade.
Spread the mixture in a single, even layer across the prepared baking sheet, ensuring the pieces aren't crowded so they roast properly.
Bake 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 sprinkle with freshly chopped parsley before serving.