In a large bowl, toss sweet potato, squash, parsnip, carrot, and onions with oil to coat and season with salt and pepper.
Transfer vegetables to 2 parchment-lined baking sheets. Roast vegetables in the preheated oven, occasionally stirring, until browned, about 30 to 40 minutes.
Drizzle molasses* on vegetables and garnish with pomegranate arils and parsley.