Line the springform pan with parchment paper and set aside. Pour the milk and heavy cream into a saucepan and heat gently. Add the panna cotta mix packets, stirring to prevent sticking. Before the mixture thickens too much, add the gelatin mix and stir.

Continue stirring for a few minutes, then turn off the heat and pour the mixture over the sponge cake layer.

Let it cool. Using a piping syringe or bag, add the Nutella on top, then refrigerate for a few hours. Serve chilled. Enjoy your snack!