Add the pasta and cook for 1 minute longer than the package directions. Drain, rinse with cold water, and let cool. In a very large bowl, whisk together the mayonnaise, sour cream, chives ...

Add the pasta to the same pot of boiling water and cook for 1 minute longer than the package directions. Drain, rinse with cold water, and let cool. In a blender, combine the sour cream, mayonnaise, ...