Mix the custard powder, sugar and vanilla in a pot. 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).

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

Meanwhile, melt the butter in a pan over low heat. Add the crushed biscuits, mix well and heat for 2-3 minutes.

Place a layer of the biscuit crumbs (about 3 teaspoons) in each of the dessert dishes. Put them in the refrigerator for 15 minutes.

Then pour the custard mixture over the biscuits crumbs.

Refrigerate for 4-5 hours and serve.