Polish Pierogi with a Fermented Dough and Cheesy Filling

Method

1. In a small bowl, dissolve yeast in warm water and let sit for 5 minutes until frothy.
2. In a large mixing bowl, combine flour, salt, and yeast mixture. Gradually add water while stirring until a dough forms.
3. Knead the dough on a floured surface for 8-10 minutes until smooth and elastic. Place in a greased bowl, cover, and let rise for 1 hour in a warm place.
4. While dough rises, prepare the filling: mash potatoes with butter, salt, and pepper. Mix in sour cream and grated cheese.
5. Once dough has risen, divide into 12 equal portions. Roll each into a circle, fill with potato-cheese mixture, and seal the edges.
6. Bring a large pot of salted water to a boil. Add pierogi and cook for 3-4 minutes until they float to the surface.
7. Remove with a slotted spoon and serve with additional sour cream and chopped chives.