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Preheat your oven to 180C/160C Fan and line a 9x9" square tin with parchment paper.
In a large bowl, add your melted butter and sugars and beat till smooth.
Add in the eggs and vanilla and beat again till smooth.
Add in the flour and cornflour and beat till a thick blondie mixture is made - it really doesn't take long to create this mixture!
Add in your white chocolate and fold through!
Pour the mixture into the tin, and spread. Dollop on the biscoff spread and lightly swirl through the blondie mixture.
Sprinkle on the chopped biscuits!
Bake the Blondies in the oven for 25-30+ minutes, or until there is a slight wobble in the middle. (See notes below)
Leave to cool in the tin, or on a wire rack.
As an optional extra, you can 'set' your blondies in the fridge for an hour or so to help with the texture! ENJOY!