Hungarian cheese puffs

To make these 1 kg puffs we need:

-500 gram flour
-1 package dry yeast (7 gram)
-1 teaspoon sugar
-1.5 dl warm water
-200 gram butter
-1 tablespoon salt
-2 eggs (divided to yolks and egg whites)
-1/2 cup plain yogurt
-250 shredded cheese

First mix the salt, flour and the butter. In another small bowl, add the sugar to the warm water and then mix the dry yeast in it with your fingers. (If we use metal spoon the yeast will not work) Mix the egg yolks with the yogurt and add it to the flour mixture, then add in the yeast. The dough might be knead. When you see the dough has come together, place a cloth on top of the bowl and set it aside. Put down somewhere warm for 30 mins. After 30 mins roll the dough out, make a "bag" and cover it with the cloth, after that leave the bowl alone for 30 mins. After the 30 mins, roll the dough out about 2 cm thickness. Get a roll or biscuit cutter and start cutting. Plac the little puffs on a baking paper. Beat the egg whites slightly. Sprinkle some slat and add the cheese on each top. Bake them for 15 mins on 190 C you may get these delicious cheese puffs: