Preheat your oven to 400°F (200°C) and line a large rimmed baking sheet with parchment paper for easy cleanup.
Peel and slice the carrots and parsnips into 1/2-inch thick rounds or cubes, and cut the red onion into thick wedges.
In a mixing bowl, toss the prepared vegetables with 0.5 tablespoons of olive oil and half of the rosemary, thyme, salt, and pepper.
Pat the chicken breast dry with a paper towel and place it in the center of the baking sheet.
Rub the chicken with the remaining olive oil, minced garlic, and the rest of the herb seasoning blend.
Spread the vegetables in a single layer around the chicken, ensuring they are not overcrowded so they roast properly.
Bake for 25 to 30 minutes, or until the chicken is cooked through and the vegetables are golden and tender.
Allow the chicken to rest for 5 minutes before slicing against the grain to ensure maximum tenderness.