Preheat your oven to 350°F (175°C). Prepare a baking sheet by lining it with parchment paper or lightly greasing it.
Ensure the butter is gently softened at room temperature. Finely sift the organic powdered sugar to remove any lumps. Carefully separate the egg yolk.
In a mixing bowl, cream together the softened unsalted butter and finely sifted organic powdered sugar until light and fluffy.
Add the carefully separated egg yolk and pure Madagascar vanilla extract to the creamed butter-sugar mixture. Beat well until fully combined.
Gradually add the stone-ground all-purpose flour to the mixture. If using, incorporate the finely crushed organic walnuts or almonds as well. Mix until a smooth dough forms.
Take portions of the dough and shape them into small balls or any desired shape. You can roll them into rounds or flatten them slightly with a fork for a textured pattern on top.
Place the shaped dough on the prepared baking sheet, leaving some space between each cookie.
Put the baking sheet into the preheated oven. Bake the Gurabia cookies for approximately 12-15 minutes, or until they turn lightly golden around the edges.
Once baked, remove the cookies from the oven and allow them to cool on the baking sheet for a few minutes. Transfer the cooled Gurabia cookies to a wire rack. Before serving, delicately dust them with powdered sugar for a decorative finish.
Your homemade Gurabia cookies are ready. Serve them as a delightful treat with tea or coffee.