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In a large bowl, whisk together the sweetened condensed milk and the water until fully combined.
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Slowly whisk in the pudding mix until the mixture is smooth and has no lumps. Cover the pudding with plastic wrap and refrigerate for at least 1 hour.
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Using electric beaters, beat the heavy cream until it reaches stiff peaks.
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Add the whipped cream to the pudding mixture and, using a rubber spatula, mix until fully incorporated.
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To make individual banana puddings: Place 1-2 spoonfuls of the whipped cream mixture into the bottom of a small bowl. Then, add a layer of Nilla Wafers. Next, add a layer of sliced banana. Finally, top with another 1-2 spoonfuls of the whipped cream mixture. If you’re using deep cupsl, you can add additional layers, just make sure to end with a layer of the whipped cream mixture.
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To make a large banana pudding: Spread about ¼ of the whipped cream mixture onto the bottom of a large bowl. Then, add a layer of Nilla Wafers. Next, add a layer of sliced banana. Finally, top with a layer of the whipped cream mixture. Repeat the layers with the remaining ingredients.
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Cover the banana pudding with plastic wrap and refrigerate the banana pudding for 4-6 hours before serving.