Preheat the oven to 180°C fan / 200°C conventional and line two large baking trays with greaseproof paper.
Chop the Terry's Chocolate Orange into small chunks. Set aside.
150 grams Terry's Chocolate Orange
Break up the dark chocolate into a glass bowl and add the butter. Microwave for 60 seconds or until melted. Whisk in the cocoa powder.
100 grams Unsalted butter, 150 grams 70% Dark chocolate, 20 grams Cocoa powder
In a separate bowl, whisk the egg and both sugars together for 2 minutes until thick and foamy.
1 large Egg, 100 grams White caster sugar, 100 grams Light brown sugar
Add the melted chocolate mixture AND the flour to the whisked egg mixture. Fold to make a thick cookie dough.
120 grams Self-raising flour
Fold in the orange zest and Terry's Chocolate Orange chunks.
1 medium Orange
Scoop up heaped tablespoons of dough, roll into balls and arrange on the trays, leaving a little space between each so the cookies have room to spread out. Use the palm of your hand to flatten the cookies down into disc shapes. You should be able to make approx. 10 cookies in total.
Bake for 10 minutes. The cookies will look soft and underbaked when you take them out of the oven, but they will continue to cook through and firm up as they cool down. Leave to cool completely on the baking tray (this will take about an hour).
Break up the white chocolate into a bowl. Microwave for 20-30 seconds, then stir and repeat until the chocolate is fully melted and smooth.
Use a spoon to spread the white chocolate on the top of the cookies to create that Christmas pudding look. Finish with the holly and berry sprinkles, then tuck in and enjoy!