What cream ingredient is NOT typically included in an alfredo sauce?

Alfredo sauce is traditionally made with a combination of butter, heavy cream, and Parmesan cheese, which creates a rich and creamy texture. Heavy cream is essential for achieving that velvety consistency, while Parmesan cheese provides a distinct nutty flavor that is characteristic of the sauce.

Sour cream is not a typical ingredient in authentic Alfredo sauce recipes. While it may add creaminess and a tangy flavor, it significantly alters the profile of the dish and is usually not used in traditional preparations. Olive oil may sometimes be included in variations of Alfredo or in other pasta sauces, but it is not a standard component of the classic recipe. The essence of Alfredo lies in its simplicity and the specific combination of heavy cream, butter, and Parmesan cheese, which distinguishes it from other creamy sauces that might incorporate sour cream.