Pan di Stelle biscuits

In a large bowl, sift together the 00 flour, unsweetened cocoa powder, baking powder, and fine sea salt.

Cut the cold unsalted butter into small cubes and add it to the dry ingredients. Using your fingertips, rub the butter into the flour mixture until it resembles coarse breadcrumbs.

Add the caster sugar, large egg, large egg yolk, and vanilla extract to the mixture. Mix with your hands until a cohesive dough forms. Do not overwork the dough.