Gather ingredients so you have everything close at hand on the table or counter.
Line two baking sheets with parchment paper or silicone baking mats.
Heat buttermilk in a small saucepan along with butter, until milk reaches 110-115℉. The butter should be starting to melt at this point.
Make the Dough
In a large mixing bowl, combine the warm buttermilk and butter, granulated sugar, large eggs, ranch dressing mix, instant yeast, kosher 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. (Or use kneading hook and electric mixer to knead the dough.)
Place dough in a greased bowl, turning once to grease top. Cover with plastic wrap and let rise in a warm place until doubled, about 1 hour.
Form and Bake Dough
Preheat oven to 350℉. Punch down dough. Turn out 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 in preheated oven 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.