Kolaczki (kolachky, Kolaches) Polish Cookies

Why I Love This Recipe
My dad used to make these when I was growing up; here is a recipe similar to his:
Ingredients You'll Need
5 cups all-purpose flour
4 egg yolks
3 teaspoons baking powder
1 pound shortening
1 cup milk
4 (.25 ounce) packages active dry yeast
1 teaspoon salt
1 cup any flavor fruit jam
1/3 cup confectioners' sugar for decoration
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Directions
*Warm milk to just above room temperature.
*Dissolve the yeast in the milk, set aside.
*In a medium bowl, stir together the flour, salt and baking powder.
*Cut in the shortening until the mixture is mealy.
*Stir in the egg yolks and milk mixture.
*Knead the dough together and then refrigerate overnight.
Preheat oven to 350 degrees F (175 degrees C).
*Dust a clean, dry surface with confectioners' sugar. Knead the dough for a few minutes.
*Carefully roll out your dough to 1/4 inch thickness.
*Cut out circles with a cookie cutter.
*Place a teaspoon of jam on the center of each circle, fold the dough over, and seal the edge with a fork.
*Bake for 12 to 15 minutes in the preheated oven.