Preheat Oven to 180•c or 400•f or Gas mark 4.
Whisk together the flour, cornflour, baking soda, baking powder and salt.
Melt the butter, and mix with the sugars, then add the egg and vanilla extract
Combine the dry ingredients with the wet ingredients, and fold in the white chocolate chunks and raspberry pieces
Roll the dough into balls and place on baking tray about 3 or 4 at a time to avoid the cookies touching.
bake for about 7 mins, they should be soft when they come out of the oven, leave them to cool. They should be slightly hard on the outside and soft and gooey in the middle :)