Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Dice the chicken breast and gold potatoes into uniform 1-inch cubes so they cook at the same rate.
In a large mixing bowl, combine the chicken, potatoes, broccoli florets, and sliced carrots.
Drizzle the olive oil over the mixture and sprinkle with garlic powder, dried oregano, sea salt, and black pepper.
Toss the ingredients thoroughly until every piece is evenly coated with oil and seasonings.
Spread the mixture in a single layer on the baking sheet, ensuring the pieces aren't crowded to allow for proper browning.
Roast for 20 to 25 minutes, tossing the medley halfway through, until the chicken is cooked through and the potatoes are golden and tender.