In a mixing bowl, whisk together the milk, heavy cream, banana puree, sugar, vanilla extract, and cornstarch until smooth.

Pour the mixture into a saucepan and cook over medium heat, stirring constantly until it thickens.

Remove from heat and let it cool.

In a serving dish, layer Biscoff cookies, followed by banana slices, and then the pudding mixture.

Repeat the layers until all ingredients are used, finishing with a layer of pudding.

Drizzle caramel sauce on top before serving.