Beat the butter , sugar and vanilla extract together , for about 5 minutes , until pale , light fluffy , then add the egg and beat until well combined .

Sift the plain flour and custard powder , together , over the butter mixture in the bowl , and using a wooden spoon , stir to combine all till comes to a dough , split the dough in two , flatten them out , wrap in plastic wrap and refrigerate for 15 minutes .

Take fingertips full of the prepared dough and roll into a ball then flatten a little and place on prepared baking tray , now taking some of the leftover chocolate chips , place them on top of the prepared cookie on the baking tray and push down a little to set them in the cookie , repeat with remaining cookie dough and chocolate chips until all done .

Place prepared cookie filled baking tray in the oven and cook for 15-18 minutes or until golden .

Once cooked remove from the heat and , before the chocolate chips cool , take a toothpick , or the likes , and drag the melted chocolate so to create spider type legs . Or you can let the cookies cool completely , and using a black gel pen , make little squiggle spider legs off the chocolate chips in the cookie .

Once all are done , place on a serving plate and serve or store in an airtight container until needed , enjoy . :-)