Preheat your oven to 180ºc/160ºfan and line a 9x9" square tin with parchment paper.
In a large bowl, add the melted butter and sugars and beat until smooth.
Add in the eggs and vanilla and beat again until smooth.
Add in the flour and cornflour and beat until a thick blondie mixture is made.
Add the white chocolate chips, raspberries and freeze dried raspberries and mix through
Pour the mixture into the tin, and spread.
Bake the blondies in the oven for 25-30 minutes, or until there is a slight wobble in the middle.
Leave to cool in the tin, and then set in the fridge for 2-3 hours.
Drizzle over the extra melted white chocolate and sprinkle on some extra freeze dried raspberries. Set for 15 minutes in the fridge, portion and enjoy.