Crush the cookies into fine crumbs, then mix with the melted butter. Press the mixture evenly into the bottom of a tart pan and refrigerate for 30 minutes.
Soak the gelatin sheets in cold water for 5 minutes, until softened.
In a saucepan, heat the heavy cream, sugar, and vanilla extract over medium heat, but do not boil. Remove from heat.
Add the softened gelatin sheets to the cream mixture, and stir until completely dissolved.
Stir in the freshly brewed espresso, and let the mixture cool to room temperature.
Pour the coffee panna cotta mixture over the prepared cookie base. Refrigerate for at least 4 hours, or preferably overnight, until completely set.
Before serving, garnish the top of the tart with grated milk chocolate or fresh coffee beans.
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