01 - Line a baking sheet with parchment paper and arrange 8 Biscoff biscuits flat side up.
02 - In a medium bowl, gently swirl the Biscoff spread into the softened vanilla ice cream. Do not over-mix; aim for a marbled effect with visible ribbons of Biscoff throughout.
03 - Spoon equal portions of the Biscoff-swirled ice cream onto each of the 8 arranged biscuits, spreading it evenly to the edges.
04 - Place the remaining 8 biscuits on top to form sandwiches. Gently press together until the ice cream reaches the edges.
05 - If desired, dip half of each sandwich into melted chocolate and sprinkle with crushed Biscoff cookies for added texture and flavor.
06 - Place the assembled sandwiches on the lined baking sheet and freeze for at least 2 hours, or until completely firm.
07 - Remove from the freezer and serve immediately for the best texture and flavor.