Roll out the dough, on a floured surface, and cut out rounds using a glass or a 2 inch cookie cutter.
In the bowl of your mixer add the flour, salt and mix. To the bowl add the yeast mixture, egg, sour cream and butter. Mix with the paddle attachment for a couple minutes until well incorporated. Place the dough in a bowl, cover with towel and let it rest until it doubles in size.
In a small bowl mix the yeast, sugar and milk together and let sit for about 15 minutes until yeast has dissolved.