Make the Biscoff base

• Crush the Biscoff biscuits into fine crumbs.
• Mix the crumbs with the melted butter until it resembles wet sand.
• Press the mixture firmly into the lined baking dish and chill.

Cook the caramel

• Melt the butter with the sugar and golden syrup in a saucepan.
• Stir in the condensed milk and cook gently, stirring constantly, until thick and golden.
• Pour the caramel over the chilled base and smooth the top.

Melt the white chocolate topping

• Melt the white chocolate gently until smooth.
• Stir in the Biscoff spread until fully combined.

Assemble and set

• Pour the white chocolate and Biscoff mixture over the caramel layer.
• Decorate with a whole Biscoff biscuit and Biscoff crumbs.
• Chill until fully set before slicing.