Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper.
Dice the chicken breast into 1-inch bite-sized pieces and chop the broccoli, bell pepper, and zucchini into uniform sizes to ensure even cooking.
In a large mixing bowl, combine the chicken and vegetables, then drizzle with olive oil.
Sprinkle the garlic powder, onion powder, dried oregano, sea salt, and black pepper over the mixture.
Toss everything thoroughly until the chicken and vegetables are completely and evenly coated in the oil and spice blend.
Spread the mixture in a single layer on the prepared baking sheet, making sure not to overcrowd the pan so the ingredients roast rather than steam.
Roast for 18 to 22 minutes, tossing the ingredients halfway through, until the chicken is cooked through and the vegetables have developed crispy, golden edges.