Heat oven to 350 degrees. In a medium bowl, toss parsnips with oil, salt, and ¼ cup maple syrup. Spread on a baking sheet and roast about 30 minutes, or until parsnips are golden brown and softened. As parsnips are roasting, bring water to a boil. Place carrot, onion, parsley, bay leaves, and peppercorns on a double layer of cheesecloth. Wrap and tie securely, and add to water. Bring to a boil; then lower to simmer 30 minutes.
Remove parsnips from oven and add to vegetable-infused water. Add remaining maple syrup, white pepper, and salt to taste. Simmer 20-30 minutes. Discard cheesecloth bundle.
Using a food processor or immersion blender, puree parsnips and broth. Add cream and simmer another 10 minutes, or until slightly thickened. Season with salt and white pepper to taste.