In a large bowl, combine yeast, warm milk, sugar and 1 cup of flour
Cover and let it rise until doubled in size.
Melt the butter.
Beat the eggs, salt, and half of the melted butter
Add egg mixture to yeast mixture and blend.
Stir in about two more cups of flour, 1/2 cup at a time. The dough should be soft and moist, but not sticky. Add more flour as needed.
On a floured surface, knead the dough until dough is smooth and highly malleable, about 10 minutes.
Put dough in a lightly oiled bowl, cover and let rise until doubled in size, about 1 hour.
After dough has risen, punch it down and pull off egg size pieces.
In your hands, roll pieces into balls and then flatten to about 3-4 inches in diameter.
Place 2 tablespoons of the apple pie filling in the center of each piece, then fold over and pinch to seal.
Place the kolaches seam side down on a greased baking sheet, cover and let rise for another 30-45 minutes.
Preheat oven to 375 degrees.
Brush the tops with melted butter and bake until lightly browned about 15-18 minutes.
Brush with the remaining melted butter one more time when they come out of the oven Serve warm.