Line a square baking tin with parchment paper and set it aside for later use (I used a 9″ baking tin).
Crush the Biscoff biscuits into small pieces. You’ll want a few large chunks and some smaller crumbs for a variety of textures.
250 g Biscoff Biscuits
Add white chocolate and milk chocolate to a large mixing bowl and melt it in the microwave on a medium heat. Stop the microwave every 10 to 15 seconds and stir thoroughly.
200 g White Chocolate, 200 g Milk Chocolate
Add Biscoff spread to a small mixing bowl and melt it in the microwave on a medium heat. This should take around 20 to 30 seconds. After 10 to 15 seconds, stop the microwave and stir the spread.
200 g Biscoff Spread
Mix the melted Biscoff spread into the melted chocolate and stir it together until evenly distributed.
Add the crushed biscuits and chocolate raisins into the mixing bowl and mix it together until evenly distributed.
100 g Raisins, 250 g Biscoff Biscuits
Pour the tiffin mixture into a lined baking tin and press it down using the back of a spoon.
To make the topping, melt Biscoff spread in the microwave on a medium heat and pour the melted Biscoff over the tiffin mixture.
200 g Biscoff Spread
Top with broken pieces of Biscoff biscuits, then place it in the fridge for 2 hours or until hardened. Once set, cut the tiffin into slices.
5 Biscoff Biscuits
Video
Notes
To cut the tiffin without breaking the topping: place a sharp knife into hot water for a few minutes, wipe it dry and cut the tiffin into your desired shape.