Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Cut the chicken breast into bite-sized cubes and place them in a large mixing bowl.
Slice the zucchini into half-moons and chop the red bell pepper and broccoli into uniform pieces, then add them to the bowl with the chicken.
In a small jar or bowl, whisk together the extra virgin olive oil, lemon juice, lemon zest, dried oregano, and garlic powder until well combined.
Pour the lemon-herb dressing over the chicken and vegetables, tossing thoroughly to ensure every piece is evenly coated.
Spread the mixture onto the prepared baking sheet in a single layer, ensuring enough space between pieces for even roasting.
Roast in the oven for 20 to 25 minutes, or until the chicken is cooked through and the vegetables have developed slightly charred, golden edges.
Remove from the oven and season immediately with sea salt and black pepper.
Garnish with freshly chopped parsley and serve warm.