In large mixing bowl, combine the warm buttermilk, sugar, butter, eggs, ranch dressing mix, instant yeast, salt, and 4 cups flour. Beat until smooth. Stir in enough remaining flour to form a soft dough. Turn onto a floured surface; knead until smooth and elastic, about 6-8 minutes. Place in a greased bowl, turning once to grease top. Cover and let rise in a warm place until doubled, about 1 hour.
Punch down dough. Turn onto a lightly floured surface. Divide dough into fourths. Roll each portion into a 14-in x 12-in rectangle. Roll up jelly-roll style, starting with a long side. Pinch seams to seal and tuck ends under. Place seam side down on two baking sheets lined with parchment paper or silicone baking mats. With a sharp knife or lame, make five shallow slashes across the top of each loaf. Cover and let rise in a warm place until doubled, about 30 minutes.
Bake at 350 degrees for 20-25 minutes or until golden brown. Brush with melted butter. Remove from pans to wire racks to cool. Makes 4 loaves. May wrap and freeze if desired.
Notes
*Unless otherwise indicated, all butter on this recipe site is salted.