Preheat oven to 350F.
Place all the ingredients in a large bowl. Using your hands mix it all to form a moist dough. This may take a while and you may feel like there is not enough liquid, keep on kneading and the dough will form.
Divide the dough into 2 or 3 parts.
Flour the surface of your workplace and roll the first part into 1/4" thick.
Using a 2 1/2" circle cookie cutter, cut the rolled dough into circles and fill each in the center with 1/4-1/2 teaspoon filling.
Dip your finger or a small brush into water/egg white and apply around the edges of each cookie.
Carefully fold the sides to form a triangle and pinch it at the point where the sides meet towards the center to enclose the filling.
Place cookies on a baking sheet and refrigerate for no less than an hour or freeze for 30 minutes.
Bake cookies for 12-15 minutes or until golden. Allow cookies to cool on the baking sheets for about 5-10 minutes, transfer to a cooling rack.
When cooled sprinkle powdered sugar on top.