Mix sugar nd butter whisk until its smooth.

Add egg,vanilla and keep whisking add salt,then little by little,add the flour till u make a smooth and soft dough.

Divide dough into two halves, mix 1 half with cocoa powder. Cut both doughs into small cycles using a bottle cap.

Arrange then one on each other,to make a longitudinal line,then using ur hand,curve it to make a round shape

Arrange in a baking tray,bake in an preheated oven for 15mins.