In a small pot, mix together the custard powder, sugar and vanilla extract. Gradually add cold milk and stir until well blended.

Bring to a boil over medium heat. Continue cooking over medium-low heat, stirring constantly until thickens (about 10-11 minutes). Do not leave it unattended.

Remove from the heat and let the custard cool down to room temperature.

Arrange a layer of vanilla wafers on the bottom of your dessert dishes (I used 4 dishes).

Cover with a layer of sliced bananas.

Then pour the custard mixture over the bananas.

Refrigerate overnight. Garnish with whipped cream or sliced bananas and serve.