Take a butter in a bowl and beat it with beater

Then add Sugar and mix well like a fluffy way

Then add Refined flour, Vanilla essence make a dough

Divide this dough in two portion. In one part add Cocoa Powder mix it well.

Then mix the both portion and then cover it with plastic sheet and keep it in fridge atleast 20 minutes

After 20 minutes cut this dough in equally portion and bake it atleast 15 minutes in 170 degree preheated oven