Make the Pudding Base:

In a mixing bowl, whisk together the sweetened condensed milk and ice-cold water. Add the instant pudding mix and whisk until smooth. Cover and refrigerate for at least 4 hours, or overnight, until set.

Whip the Cream:

In another bowl, whip the heavy cream until stiff peaks form.

Fold the Cream into the Pudding:

Gently fold the whipped cream into the chilled pudding mixture until no streaks remain.

Assemble the Layers:

In a 9x13-inch dish or trifle bowl, create a base layer of Nilla wafers. Top with a layer of sliced bananas, followed by a layer of the pudding mixture. Repeat the layers until all ingredients are used, finishing with a pudding layer.

Garnish:

Decorate the top with extra Nilla wafers or banana slices, if desired.

Chill:

Cover and refrigerate for at least 4 hours before serving to allow the flavors to meld.

Serve:

Scoop into bowls or plates and enjoy this creamy, indulgent dessert!