Preheat your oven to 400°F (200°C) and line a large baking sheet with parchment paper for easy cleanup.
Peel and cube the sweet potato into 1-inch pieces, and slice the carrots and parsnips into 1/2-inch thick rounds.
In a large bowl, toss the sweet potato, carrots, and parsnips with the extra virgin olive oil, sea salt, black pepper, rosemary, and thyme until evenly coated.
Spread the vegetables in a single layer on the prepared baking sheet, ensuring they aren't overcrowded so they roast rather than steam.
Roast for 25-30 minutes, tossing halfway through, until the vegetables are tender and the edges are golden and caramelized.
While the vegetables roast, remove the skin from the rotisserie chicken and slice or shred 5 ounces of the breast meat.
During the final 5 minutes of roasting, place the chicken on the baking sheet with the vegetables to warm it through.
Transfer the roasted root vegetables and chicken to a plate and garnish with freshly chopped parsley before serving.