Method:

Combine the sugar and butter and whisk together until pale and fluffy.
Add in your eggs one at a time and mix until incorporated.
Once the eggs are fully mixed in add a teaspoon of vanilla and mix until combined.
Add flour, baking powder and salt and then mix slowly until evenly incorporated.
Add your chocolate chips and give it a final mix until the dough has formed.
Wrap your cookie dough in cling film and leave to chill for two hours in the fridge.
Once dough is cooled, weigh out 400g of cookie dough and roll into a ball.
Pop the ball in the centre of your baking tray and gently press down into a large puk shape.
Bake at 160c for 30-35 minutes until golden brown on the edges.
Leave to cool before decorating.
While your cookie is cooling you can make your buttercream by beating the icing sugar, butter and cocoa together until smooth.
Pop your buttercream in the piping bag and once the cookie is cool, get creative and decorate!

Happy baking!

Millie’s Cookie recipe: how to bake a giant celebration cookie at home