01 -
Combine the condensed milk with cold water in a big bowl. Whisk well, making sure it’s smooth. Add the pudding mix, whisking fast until it’s fully blended and without lumps. Cover the bowl and chill it for around 4 hours to set.
02 -
In another large bowl, beat the heavy cream until you see soft peaks. Mix in the marshmallow fluff and keep whipping until firm peaks hold their shape.
03 -
Carefully mix the whipped cream into the pudding in small amounts. Fold gently to keep the light texture. Stir just until blended, making sure you don’t overmix.
04 -
Using a 9x13 dish or a big bowl, stack ingredients in this order: cookies first, then banana slices, and about a third of the pudding mixture. Keep layering this way two more times, finishing with the pudding layer on top.
05 -
Sprinkle crumbled vanilla wafers over the top if you want. Put the dish in the fridge for at least another 4 hours before eating.