Prepare the base: combine the cookie crumbs with the melted butter, press into a springform pan, and refrigerate for 30 minutes.
Soak the gelatin sheets in cold water for 5 minutes to soften.
In a saucepan, melt the granulated sugar over medium heat until golden brown, then add the butter and stir to combine.
Pour in the milk and a pinch of salt, and stir until you have a smooth caramel. Let it cool slightly.
Squeeze out the excess water from the gelatin sheets, then stir them into the lukewarm caramel until completely dissolved.
Mash the bananas, then mix with the mascarpone cheese, powdered sugar, and vanilla sugar.
Whip the heavy cream to stiff peaks, then gently fold it into the mascarpone-banana mixture.
Pour the caramel cream into the mousse and gently stir to combine.
Pour the mousse onto the cookie base and smooth the top. Refrigerate for at least 4 hours to set.
Garnish with banana slices and extra caramel sauce, then slice and serve!
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