Not to brag, but this is the best version of homemade ranch mashed potatoes around. The fresh herbs really add some zing to this side and beautifully complement sour cream and buttermilk's tang. For the fluffiest mashed potatoes, place the potatoes back in the pot after draining them and put them on low heat—this will remove any extra and unwanted moisture. This recipe will also work with russet potatoes instead of Yukons or plain yogurt instead of sour cream. Thin out leftover mashed potatoes with a splash of milk or water.