Combine the crushed cookies with the melted butter and press into the bottom of a 20 cm (8-inch) cake pan. Refrigerate for 15 minutes to set.
Melt the white chocolate over a double boiler and let it cool slightly.
Whip the heavy cream until stiff peaks form. Gradually add the powdered sugar and vanilla extract.
Dissolve the gelatin in a small amount of hot water. Let it cool, then stir it into the melted white chocolate.
Gently fold the white chocolate mixture into the whipped cream until light and airy.
Pour the mousse mixture over the cookie crust and smooth the top. Refrigerate for at least 4 hours, or preferably overnight, to set completely.
Before serving, decorate with fresh berries such as blueberries, raspberries, or blackberries.
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