Preheat your oven to 425°F.
Rinse the chicken breast and pat it dry with paper towels.
In a small bowl, mix the olive oil, minced garlic, mixed fresh herbs, salt, and black pepper.
Rub the herb mixture all over the chicken breast to ensure even coating.
Chop the carrot, parsnip, and red onion into evenly sized pieces for uniform roasting.
Place the chopped vegetables on a baking tray and lightly drizzle with a little extra olive oil if needed, then season with salt and pepper.
Nestle the seasoned chicken breast among the vegetables on the tray.
Roast in the preheated oven for approximately 20-25 minutes or until the chicken is thoroughly cooked and the vegetables are tender and caramelized.
Check that the internal temperature of the chicken reaches at least 165°F before removing from the oven.
Let the dish rest for a few minutes, then serve warm.