Preheat your oven to 180°C (160°C for fan ovens) and line a large tray or two with baking paper.
Add the softened butter to a large bowl with the caster sugar and brown sugar. Mix well until combined, using a stand mixer or electric whisk to assist if needed.
Add the egg and orange extract and mix well until smooth.
Stir in the flour and cocoa powder. When it's starting to stick together, use your hands to press it together into a ball of dough.
Set aside 12 segments of the Chocolate Orange and chop the rest into small chunks. Add the chopped pieces to the cookie dough along with the dark chocolate chips.
Divide the dough into 12 pieces and roll each one into a ball. Place them on your lined tray, leaving a little space in between to allow for spreading.
Bake the cookies for 11-12 minutes until firm around the edges. They may look a little underdone but they'll firm up as they cool.
While the cookies are still warm, add a Chocolate Orange segment to each cookie then press in the gold stars and sprinkle over the orange zest.
Let the cookies cool completely before removing them from the tray then enjoy!