Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Peel and dice the sweet potato into 1-inch cubes and slice the carrots into half-moons.
Mince the garlic clove finely.
Cut the chicken breast into bite-sized pieces to ensure even cooking with the vegetables.
In a large mixing bowl, combine the chicken, sweet potato, carrots, garlic, olive oil, rosemary, salt, and pepper.
Toss the mixture thoroughly until every piece is evenly coated in oil and seasonings.
Spread the mixture across the prepared baking sheet in a single layer, ensuring pieces are not overcrowded.
Roast in the oven for 25 to 30 minutes, tossing halfway through, until the chicken is cooked through and the vegetables are tender with crispy edges.