Pastry with Lekvar Filling 
(Lekvár is a thick jam)

Makes about 50 pastry
Serving Suggestion - Two (2)

Kolache Dough Ingredients
9 cups flour
8 egg yolks (save the whites)
1 pound butter, melted
1 cup sugar
1 cup Crisco or a generic shortening
2 cans evaporated milk 
2 cakes yeast
1 teaspoon salt

Kolache Method
Sift flour then work in shortening as 
for pie dough. Dissolve yeast in a little 
lukewarm milk and add to mixture. Add all the rest of the ingredients and knead until well mixed. 
Divide dough into small balls and allow to rise on a floured board for 3 hours. Roll dough thin and cut into 3"x’3" squares, spread on nut, poppy seed or any fruit paste for a filling. Fold ends over to keep filling from seeping out during baking. Brush with beaten egg whites mixed with a little sugar and allow to rise about ½ hour. Bake at 325F for about 30 minutes or until light brown. Let cool then sprinkle with confectionary (powder) sugar.

Kolache nut filling recipe
1 lb fine ground walnuts 
1/4 cup milk 
4 tablespoons melted butter 
1 cup sugar 
Mix everything together to make a paste

Kolache poppy seed filling recipe
1 lb ground poppy seed
2 cups sugar
1 cup seedless golden raisins
1 teaspoon  vanilla

Combine ingredients, add enough milk to make filling of right consistency to make a paste.

Both nut and poppy seed fillings will make 50 pastry. Double this entire recipe to make 100 for large groups or for giving or sending as a Holiday baked gift.

Kolache prune filling recipe
1 large package of dried prunes (the pitted ones cost more but are easier to use)
1 teaspoon cinnamon
1 teaspoon vanilla
3/4 cups sugar

Cover the prunes with water in a medium-sized saucepan and simmer until tender. Drain the liquid. Mash the prunes until smooth if the pitted type is used. If using prunes with the pits still in them,
remove the pits with your fingers. then add the cinnamon, vanilla,
and sugar. This recipe makes enough filling for one batch of
kolaches, 3 to 4 dozen.

Kolache apricot filling recipe
1-1/2  cups dried fruit, apricot, tightly packed then boiled until soft
3/4  cup sugar  
1 teaspoon cinnamon  
1 teaspoon vanilla extract
Place in a food processor to make a thick paste

As far as fruit jam fillings (Czech Lektvar) you can use dried fruits then boil them until soft , adding sugar and other ingredients then place all in a processor to make a very thick puree. 
Using dried fruits can be expensive so use a ready mix like Solo Brand of Pastry Fillings or Baker Dessert Fillings and if you don't have time to make dough then use Athens Fillo pastry sheets.​