Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Peel and dice the sweet potato, carrots, and parsnips into uniform 1/2-inch cubes to ensure even roasting.
Cut the chicken breast into bite-sized pieces, similar in size to the vegetable cubes.
In a large mixing bowl, combine the cubed chicken, sweet potato, carrots, and parsnips.
Drizzle the mixture with extra virgin olive oil and sprinkle with dried rosemary, sea salt, black pepper, and garlic powder.
Toss everything thoroughly until the chicken and vegetables are evenly coated in the oil and spices.
Spread the mixture in a single layer on the prepared baking sheet, ensuring the pieces are not overcrowded.
Roast for 25-30 minutes, tossing halfway through, until the chicken is cooked through and the root vegetables are tender and caramelized.