Sour Cream sauce is very easy to make. Generally, it's sour cream mixed with cilantro, lime juice, garlic and salt. However, for this recipe, I cheat a little bit and mix the sour cream with the cream of chicken soup. I think it makes the sauce creamier and add the same delicious filling that is in the enchiladas as well. I hope you try out this new way of making sour cream sauce and let me know what you think.