Directions

1. In a small bowl, dissolve yeast in warm milk and let stand until foamy.
2. In a large bowl, combine flour, sugar, and salt.
3. Add yeast mixture, egg yolks, softened butter, and vanilla; mix until dough forms.
4. Knead dough on a lightly floured surface until smooth and elastic, about 10 minutes.
5. Place dough in a greased bowl, cover, and let rise until doubled, about 1 hour.
6. Roll out dough to 1/2 inch thickness and cut into circles.
7. Place a teaspoon of fruit preserves in the center of half of the circles, top with remaining circles, seal edges.
8. Heat oil to 350F (175C), fry paczki until golden brown on both sides, about 2-3 minutes per side.