Preheat oven to 350F and line two cookie pans with parchment paper.
Place ingredients in a big bowl, and mix with your hands until a dough form.
Divide the into 4 pieces.
Flour the surface of your work area and roll each piece 1/4" thick.
Cut the rolled dough to a 2" circles and apply 1/4 teaspoon of filling in the center of the dough.
Use the egg white leftover to brush some around the edges of the cut circles.
Form a triangle by lifting each circle with your two index fingers and pinching the corner where the dough meets. Repeat with the other two corners.
If time permits, place the unbaked cookies in the refrigerator or freezer for about 30 minutes.
Bake for 12 minutes. Remove from the oven and let cool before sprinkling sugar.