Preheat your oven to 400°F and line a large rimmed baking sheet with parchment paper.
Chop the red potato and carrots into half-inch cubes and halve the brussels sprouts for even roasting.
In a small bowl, whisk together the olive oil, minced garlic, dried rosemary, dried thyme, sea salt, and black pepper.
Place the chicken breast and the chopped vegetables into a large mixing bowl.
Pour the garlic-herb oil over the chicken and vegetables, tossing until every piece is well-coated.
Spread the mixture in a single layer on the prepared baking sheet, ensuring the chicken is in the center.
Roast for 20 to 25 minutes or until the chicken reaches an internal temperature of 165°F and the vegetables are golden.
Let the chicken rest for 5 minutes before slicing and serving with the tender roasted root vegetables.