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 uniform 1-inch bite-sized pieces to ensure they cook evenly.
Peel the russet potato and the carrots, then dice them into 1/2-inch cubes so they soften at the same rate as the chicken.
In a large mixing bowl, combine the chicken, potatoes, and carrots.
Drizzle the extra virgin olive oil over the mixture and sprinkle with garlic powder, sea salt, black pepper, and dried oregano.
Toss everything thoroughly with your hands or a large spoon until every piece is well-coated in oil and seasoning.
Spread the mixture onto the prepared baking sheet in a single layer, making sure not to crowd the pieces so they can roast instead of steam.
Bake for 25 to 30 minutes, tossing the ingredients halfway through, until the chicken is golden and the potatoes are tender when pierced with a fork.