Butter and flour are mixed together before joining the eggs.
Add softened butter, salt, and orange zest to the flour and mix.
Once you have this crumbled dough add all the sugar and start to knead.
Add the egg, previously broken in a bowl, and beat the whites and yolk until it becomes one.
Knead the dough for a few minutes and when it reaches nice consistency, create a ball.
Put the ball in plastic wrap and let it sit in the refrigerator for at least 1hr.
Preheat the oven to 180°C (356°F).
Remove the dough from the refrigerator and roll it out on a lightly floured surface to a thickness of 1/4″.
Using a 2.5-Inch Round Stainless Steel Cutter, mold the dough.
Place on a parchment-lined baking sheet.
Bake at 180°C (356°F), until lightly golden brown