My tips for getting a smooth alfredo sauce start with quality ingredients. High quality butter, full fat whipping cream and freshly grated parmesan cheese will all help create the best flavor texture in your sauce. The second part is to make sure you are simmering the heavy cream but not boiling it. You do not want it to curdle. Lastly, when you add the parmesan cheese, be sure to whisk constantly for even and through melting.