Combine the crushed graham crackers with the melted butter, and press into the bottom of a 20 cm springform pan. Refrigerate for 15 minutes to set.
In a bowl, combine the mascarpone cheese with the powdered sugar and vanilla extract until smooth and creamy.
Mash the bananas and stir them into the mascarpone cream.
Dissolve the gelatin in a little hot water, let it cool slightly, and then stir it into the banana cream.
Whip the heavy cream until stiff peaks form, then gently fold it into the banana cream, being careful not to deflate it.
Pour the cream over the graham cracker crust and smooth the top. Refrigerate for at least 4 hours, or preferably overnight, to set completely.
Before serving, garnish with fresh banana slices and a sprinkle of grated chocolate.
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