Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Cut the chicken breast into uniform 1-inch cubes and slice the bell pepper and zucchini into bite-sized pieces.
In a large mixing bowl, whisk together the extra virgin olive oil, lemon juice, dried oregano, garlic powder, sea salt, and black pepper.
Add the chicken cubes, broccoli florets, bell pepper, and zucchini to the bowl and toss thoroughly until every piece is coated in the herb oil.
Spread the chicken and vegetables out on the prepared baking sheet in a single, even layer to ensure proper roasting.
Roast in the center of the oven for 20 to 22 minutes, or until the chicken is cooked through and the vegetables are tender with slightly browned edges.
Remove from the oven and serve immediately while the flavors are vibrant and the chicken is juicy.