In a large Dutch oven, combine water, 1 tablespoon salt, and potatoes over medium-high heat. Bring to a boil; cook for 10 to 15 minutes or until tender.
Drain potatoes well, and return to sauce- pan. Add sour cream and butter. Using a potato masher, mash potato mixture until butter melts. Add Parmesan cheese, truffle oil, parsley, remaining 1 teaspoon salt, and pepper, stirring to combine well.
Recipe by Southern Lady Magazine at https://southernladymagazine.com/parmesan-truffle-mashed-potatoes/