Beat the egg whites until stiff and shiny. Add the sugar, leaving the mixer running, and continue to beat until stiff peaks form.

Preheat oven to 325 degrees Fahrenheit (170 degrees Celsius).

Remove from oven, let cool, and transfer to an airtight container.

Turn the mixer to low and add the egg yolks, oil, orange juice, vanilla, and baking powder. Add the flour one cup at a time until it forms a dough, and the coconut, if desired. Turn off the mixer and remove the beaters. Continue to add flour while kneading by hand, until dough is soft, well-mixed, and a bit sticky. Let dough sit for about 20 minutes and up to an hour.

Divide the dough into four parts. Sprinkle flour on a piece of Gefen Parchment Paper and roll out each piece of dough, on the parchment paper, to a quarter-inch (half-centimeter) thickness. Cut into squares. Prick each square with a fork. Transfer the paper to a baking sheet.

Bake in preheated oven for 15–20 minutes. The biscuits should be slightly golden.