Preheat the oven to 180 degrees celcius
Ground up the cookies until very fine, mix with the butter and pit it in your cake pan. Press firmly. Bake for 15 minutes and let it cool off.
Fill with dulche de leche (see above on how to make it). Be carefull you don't tear the base.
Divide the banana on top.
Whip up the cream and sugar until stiff peaks and divide on top of the banana. Grate some chocolate op top.
Let is set for a couple of hours before serving.