In a blender, place the corn starch biscuits and process them until crumbly. Transfer to a bowl and add the melted butter, use your hands to mix until a mixture is formed. Add this mixture to a cake pan, preferably with a removable bottom, compact this biscuit mixture in the shape of the pan, covering the bottom and the edges.
Bake in a preheated oven at 200°C (392°F) for 10 to 12 minutes.
In a blender, place the condensed milk, the table cream, the milk powder and blend very well, add the flavorless colorless gelatin previously hydrated and keep blending for another 2 minutes. Set aside.
After taking the baked crust out of the oven, add the Nutella cream and spread it all over the bottom of the pan. Add the milk mixture and let it chill in the fridge for 3 to 4 hours.
Sift some powdered milk on top and serve.