First of all preheat the Oven at 190  degree C.

Take a big bowl,whisk Butter until it becomes smooth and creamy.

Add sugar in it and whisk it again.

In another bowl add all the dry ingredients like all purpose flour,baking powder,salt,coco powder.

After making creamy mixture ready,add this dry ingredients in it and whisk it with the help of electric beater.

Let all the mixture get combined.

Now you will find ,mixture turns in to a dough.

Before you START making cookies add chopped nuts and white chocolate chunks in to the mixture.

Now gently handle this dough.make small rolls out of it.just press a little and keep it aside.

Take parchment baking sheet which is easily available in market.

Keep all the pressed rolls over it,and bake it for next 10-12 minutes in oven.