Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Dice the chicken breast into uniform 1-inch cubes and place them in a large mixing bowl.
Peel and cube the sweet potato into 1/2-inch pieces, chop the broccoli into small florets, and slice the bell pepper and zucchini into bite-sized chunks.
Add all the vegetables 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 together until the chicken and vegetables are thoroughly and evenly coated with oil and seasoning.
Spread the mixture in a single layer on the prepared baking sheet, ensuring there is space between pieces for roasting rather than steaming.
Roast in the center of the oven for 20 to 25 minutes, or until the chicken is cooked through and the vegetables are tender with golden-brown edges.
Remove from the oven and let rest for 2 minutes before serving hot.