Preheat your oven to 400°F (200°C) and line a large sheet pan with parchment paper for easy cleanup.
Dice the sweet potato into 1/2-inch cubes and slice the carrots into 1/4-inch rounds to ensure even cooking.
Cut the chicken breast into bite-sized 1-inch pieces.
In a large mixing bowl, combine the chicken, sweet potatoes, and carrots.
Drizzle with olive oil and sprinkle with sea salt, black pepper, dried rosemary, 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 sheet pan, ensuring nothing is overcrowded.
Roast for 20-25 minutes, tossing halfway through, until the chicken is cooked through and the vegetables are fork-tender and slightly browned.