Try the cream and add some more condensed milk if it's not sweet enough for you. That part really is a matter of taste.
Crumble the cookies in a food processor.
In small dessert jars alternate layers of cream and cookie crumbles. Don't make the cookie layer too think because you want them to be moist after a few hours.
Finish with some sprinkles of cookie crumbles and refridgerate for 2-3 hours.