Whisk the egg yolks into the buttermilk, Make a well in the dry ingredients, pour in the buttermilk mixture, and stir until just mixed. Add: 6 tablespoons (3/4 stick) butter, melted Stir well. In another bowl, beat the egg whites until they form soft peaks,t hen fold them into the batter. If the batter is too thick, add more buttermilk. Spoon the batter onto a preheated griddle, cooking a single pancake first to see if the griddle is the right temperature. Cook until the undersides of the pancakes are golden brown. Turn them over and cook until done.