Make the crust: Combine crushed biscuits, melted butter, brown sugar, and salt in a bowl. Mix until it resembles wet sand.
Press into pan: Firmly press the mixture into the base and up the sides of a 9-inch (23 cm) pie dish or tart tin.
Use the bottom of a glass to compact it well.
Chill: Refrigerate the crust for at least 20–30 minutes to set. This prevents crumbling when slicing.
Add caramel: Spoon the dulce de leche over the chilled crust. Spread into an even layer.
If too thick, warm it slightly until spreadable, but don’t make it hot.
Layer bananas: Slice bananas just before using. Arrange in a generous, even layer over the caramel. Add a second layer if you like it extra banana-forward.
Whip the cream: In a cold bowl, whip cream with powdered sugar and vanilla until soft peaks form.
Don’t overbeat—aim for smooth, pillowy texture.
Top and garnish: Spread or pipe the whipped cream over the bananas. Finish with chocolate shavings or a dusting of cocoa for contrast.
Chill again: Refrigerate for 1–2 hours before serving. This helps the layers settle and slices hold their shape.
Serve: Use a sharp knife to slice.
Wipe the blade between cuts for clean portions.