Preheat your oven to 400°F and line a large baking sheet with parchment paper for easy cleanup.
Peel the sweet potato and carrots, then chop them into uniform 1-inch cubes to ensure even roasting.
Mince the garlic cloves finely and slice the chicken breast into 1-inch thick medallions.
In a large mixing bowl, combine the chicken, sweet potatoes, and carrots.
Drizzle with extra virgin olive oil and sprinkle with the minced garlic, rosemary, thyme, sea salt, and black pepper.
Toss the mixture thoroughly until every piece is well-coated with the oil and aromatics.
Spread the ingredients in a single layer on the prepared baking sheet, ensuring they are not crowded so they roast rather than steam.
Roast for 25 to 30 minutes, or until the chicken is cooked through and the root vegetables are tender and golden brown.