Divide the dough into 24 equal pieces. The easiest way to divide the dough is by cutting it in halves. Continue diving until you get 24 equal pieces.
Roll out each piece into an oval shape. Place the jam on one side of the oval, folding it half way and sealing the jam. Make small cuts on the other side of the oval and fold it over to create a sliced top.
Make small cuts on the other side of the oval and fold it over to create a sliced top.
Lay out piroshki on a baking sheet. Cover them with a kitchen towel and let it rise in a warm place for at least 30 minutes.
Brush piroshki with whisked egg. Bake them at 350 °F for about 45 minutes or until golden brown.
Keep them in an air tight container. They can stay fresh for several days.