Preheat your oven to 400°F (200°C).
In a large mixing bowl, combine the sweet potatoes and carrots.
In a small bowl, whisk together the olive oil, brown sugar, cinnamon, salt, and black pepper.
Pour the brown sugar mixture over the sweet potatoes and carrots, tossing to coat them evenly.
Spread the coated sweet potatoes and carrots in a single layer on a baking sheet.
Roast in the preheated oven for about 25-30 minutes or until the vegetables are tender and caramelized, stirring once or twice during cooking.
Remove from the oven and transfer to a serving dish.
Garnish with chopped fresh parsley if desired