Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper.
Dice the sweet potato, carrots, and parsnips into uniform 1-inch cubes to ensure they cook evenly.
Mince the garlic cloves finely.
In a large mixing bowl, toss the chicken breast and diced root vegetables with olive oil, minced garlic, rosemary, thyme, salt, and pepper.
Spread the chicken and vegetable mixture in a single layer on the prepared baking sheet.
Roast for 25 to 30 minutes, flipping the vegetables halfway through, until the chicken reaches an internal temperature of 165°F and the vegetables are golden brown.
Remove from the oven and drizzle the balsamic glaze over the dish before serving.