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 slice the zucchini and bell pepper into uniform rounds and strips.
Place the chicken, broccoli florets, zucchini, and bell pepper onto the prepared baking sheet.
Drizzle the extra virgin olive oil over the mixture, then sprinkle evenly with sea salt, black pepper, dried oregano, and garlic powder.
Toss everything thoroughly with your hands or tongs to ensure the chicken and vegetables are well-coated in the oil and spices.
Spread the mixture into a single layer, ensuring nothing is overcrowded so the vegetables roast rather than steam.
Roast in the oven for 18-22 minutes, or until the chicken is cooked through and the vegetables are tender with lightly browned edges.
Remove from the oven and immediately drizzle with fresh lemon juice to brighten the flavors before serving.