Mix the butter and icing sugar together and beat until soft

Add the egg and continue beating

Add your flour, custard, flavor, salt and milk powder and mix it unit soft and keep it in the refrigerator for some minutes

Divide the dough into 4 and take one

Add cocoa powder in the one part and mix it until it turns to chocolate color

Take the 3 parts together and roll it on a board and make it flat in a round shape

Take the chocolate one in the middle and roll it then cut it according to the size you want and bake it for 15 to 20 minutes