Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper.
Cut the chicken breast into 1-inch bite-sized pieces and place them in a large mixing bowl.
Slice the zucchini into half-moons and chop the red bell pepper into 1-inch pieces.
Add the broccoli florets, zucchini, and bell pepper to the bowl with the chicken.
Drizzle the extra virgin olive oil over the mixture and sprinkle with dried oregano, garlic powder, sea salt, and black pepper.
Toss everything thoroughly until the chicken and vegetables are evenly coated in the oil and seasonings.
Spread the mixture in a single layer on the prepared sheet pan, ensuring the pieces are not overcrowded.
Roast in the oven for 20 to 25 minutes, or until the chicken is cooked through and the vegetables are tender.
Remove from the oven and immediately toss with the fresh lemon juice and lemon zest before serving.