Prepare the Dough: In a large mixing bowl, whisk together the all-purpose flour, sugar, cocoa (if using), ground cinnamon, ground cloves, and baking powder until well combined. Create a well in the center and add the eggs, olive oil, milk, and orange zest. Mix until the dough comes together, then knead gently until smooth, about 3-5 minutes. Cover the bowl with a towel and let the dough rest for 30 minutes.

Shape the Cookies: Preheat your oven to 350°F (175°C). Lightly flour your work surface, then take pieces of the rested dough and roll them into long ropes, about 1/2 inch thick. Cut the ropes into 1.5-inch diamond shapes and place them on a parchment-lined baking sheet, ensuring they are spaced about an inch apart.

Bake the Cookies: Once your oven is preheated, bake the shaped cookies for 9-11 minutes. Look for them to be dry to the touch and slightly golden around the edges.

Glaze the Cookies: While the cookies cool, prepare the glaze by whisking together the confectioners' sugar, fresh orange juice, and Cointreau (if using) in a small bowl.

Coat the Cookies: Once the cookies are completely cool, individually dip or drizzle the glaze over each cookie, allowing extra glaze to drip off. Place the glazed cookies back on the wire rack.

Allow the Glaze to Harden: Let the glazed cookies sit at room temperature for at least 12 hours to allow the glaze to harden fully.