Sift into a deep bowl flour,salt and 1/2 c. sugar.
Then cut in cold butter as for pie dough.
Dissolve yeast in warm water
Mix eggs,sour cream & dissolved yeast& add to flour mixture.Mix and knead dough until smooth.
Divide dough into 4,5or 6 balls & put back in bowl.I usually make 4,to make 2 nut & 2 poppyseed.Cover until raised,about 1 hr.
Roll out on floured bowl into thin rectangle.Spread with filling and roll up like jelly-roll.Place onto greased baking sheet ,cover and let rise 1 1/2 to 2 hrs.Brush rolls with beaten egg (that I forgot to put in recipe) the last 15 min. and pierce rolls with fork.
Bake at 350 degrees for 30-35 mins.
For nut filling mix nuts with cinnamon,sugar & vanilla.DO NOT add milk.After sprinkling nuts on roll sprinkle on milk with pastry brush. For poppy seed filling I just use canned.