Cover the shape (preferably detachable) with parchment paper.
Grind cookies in small crumbs and mix with melted butter. The mass should not be oily, but not too dry. Put the mass in the mold and tamp well. Refrigerate for half an hour.
Mix sour cream with condensed milk.
Pour gelatin 3/4 cup of water and leave for 10 minutes. to swell. Then melt it in a water bath so that it is completely dissolved.
Into the sour cream-condensed mass, slowly introduce gelatin, stirring well. Then pour into the form. And send to the refrigerator until completely solidified.