A vegan fettuccine alfredo sauce recipe using tofutti vegan cream cheese and vegan sour cream for a creamy cheese-like vegan alfredo sauce. If you're looking for a non-dairy alfredo sauce recipe for vegan fettuccine alfredo, try this one. It's particularly rich and creamy when compared to other vegan alfredo replicas since it's made with both store-bought non-dairy sour cream, vegan cream cheese, and some silken tofu to carry the base as well. This vegan fettuccine alfredo recipe is courtesy of tofutti.