Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Cut the chicken breast into 1-inch bite-sized pieces and chop the broccoli, bell pepper, and zucchini into uniform chunks to ensure even cooking.
In a small glass bowl, whisk together the extra virgin olive oil, fresh lemon juice, lemon zest, dried oregano, garlic powder, sea salt, and black pepper.
Place the chicken pieces and chopped vegetables onto the prepared baking sheet and pour the lemon-herb dressing over the top.
Toss everything thoroughly with your hands or tongs to ensure every piece is well-coated, then spread the mixture into a single layer.
Roast in the center of the oven for 18-22 minutes, or until the chicken is cooked through and the vegetables are tender with slightly charred, golden edges.
Remove from the oven and serve immediately, finishing with an extra squeeze of lemon if you prefer more brightness.