For Cadbury Silk Cookies
Place the chopped Bournville bar in a large glass bowl. Place the bowl over a pot of simmering water. Stir continuously until the chocolate has completely melted.
Melt the butter and place on the side to cool.
In a large bowl, combine melted butter with both varieties of sugar.
Beat the eggs and mix into the sugar and butter along with vanilla essence.
Gradually add the flour, cornflour, salt and baking soda into the mixture and combine until all ingredients are fully incorporated.
Fold melted chocolate into the mixture.
Chop 2 Dairy Milk Silk bars into 1-cm-squares (approximately) and fold into the dough. Cover and refrigerate the dough for 1 hour.
Preheat the oven to 180 degrees C.
Butter a baking tray and use 2 heaped tbsp of batter to make a cookie, leaving place for the cookie to spread.
Bake in the oven for 12–14 minutes at 180 degrees C, until the edges are crisp.
While cookies are warm, place the remaining Dairy Milk Silk bar squares on each cookie.
Allow cookies to cool.