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Remove one dough disk from the refrigerator. On a lightly floured mat, board, or counter, roll the disk into a circle about 12 inches in diameter and 1/8-1/4 inch thick. Cut 3 1/2 inch rounds as close together as possible, and place them on parchment or silicone mat-lined cookie sheets.
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Gather up dough scraps and re-roll them - making about 12 circles from each dough disk.
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Lightly brush the egg yolk around the edges of each circle, add about 1 tablespoon of apple pie filling to the center of the circle, and fold it in a three-cornered hat shape. (Pull together two sides of the circle and pull up the third.) Pinch each corner to seal it tightly and lightly brush the outside with more egg wash. Sprinkle the outside with cinnamon and sugar before baking (optional.)
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Bake one sheet of apple pie hamantaschen at a time, each for about 20-24 minutes, turning it halfway through until the corners are lightly brown. If you have 2 baking sheets, double them up, with one underneath the lined one to prevent the bottoms of the hamantaschen from burning.
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When the hamantaschen are done, cool them on the baking sheets for a few minutes, then transfer to a wire rack to completely cool.
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Store in a tightly closed container or freeze the hamantaschen.