1In a small bowl, mix the custard powder with a little bit of the milk to make a smooth paste.
In a saucepan, heat the remaining milk and sugar over medium heat until the sugar is dissolved and the milk is warm.
Gradually add the custard paste to the warm milk, stirring continuously to avoid lumps.
Cook the mixture over low heat, stirring constantly, until it thickens to a custard consistency. Remove from heat and let it cool completely.
Once the custard is cool, add the mashed banana and mix well.
In a separate bowl, whip the heavy cream until it forms soft peaks.
Gently fold the whipped cream into the banana custard mixture until well combined.
Pour the mixture into an ice cream maker and churn according to the manufacturer's instructions.
Transfer the churned ice cream to a container and freeze for at least 4 hours or until firm.
Serve and enjoy your homemade Banana Custard Powder Ice Cream!