On a floured surface roll out the pie crust to a thickness of about 1/8 to 1/4 inch.
Use a cookie cutter (2 1/2 to 3 inches in diameter) to cut out circles of dough.
Place half of the dough circles on a baking sheet. Lightly brush their edges with water.
Spoon 1 and 1/2 teaspoons of filling onto each dough circle.
Top with another dough circle. Press the edges together firmly sealing them by crimping with a fork.
In a bowl beat an egg with 1/4 teaspoon of water and brush each cookie, with this mixture.
Optionally you can sprinkle some sugar on top. Make slits in the cookies.