Process the cookies to fine crumbs. Transfer to a bowl and mix with the cream cheese, Biscoff spread, and melted white chocolate until evenly combined.
Shape the mixture into 9 balls, about the size of a small ice cream scoop. Insert a toothpick into each truffle and freeze until firm, about 1 hour.
Melt the white chocolate until smooth. Dip each truffle to coat, letting the excess drip off. Set on a parchment-lined baking sheet and remove the toothpick.
Warm the Biscoff spread briefly until pourable, then drizzle over the truffles. Finish with the crushed cookies. Chill until set.