Preheat the oven to Gas Mark 4 / 180ºc and line an 8x8" square tin with parchment paper.
Add the unsalted butter and white chocolate to a bowl and melt in short bursts in the microwave, stiring well each time, until smooth. (Ensure you stir well in between to stop it from splitting).
Once melted, stir in your caster sugar until combined.
Add in the eggs and golden syrup and stir again until combined.
Mix through the plain flour, and cornflour until you can no longer see any flour. (If you was adding any mix ins like nuts, chocolate chips or biscuits this is when you'd add them!)
Pour the mixture into the lined tin and bake for 25-30 minutes (mine take 28 minutes), take them out the oven when there is an ever so slight wobble in the middle.
Let the blondies cool in the tin fully, and then set the blondies in the fridge for 3-4 hours or overnight for best results!
Slice your blondie into 9 slices and enjoy!
