Set aside 15g of the chocolate for decoration
Chop the rest of the chocolate into small pieces and tip into a bowl; heat half of the cream to just about boiling and pour over the chopped chocolate, leave for 1 minute then stir until smooth
Spoon the peanut butter into a mixing bowl with the sugar and gradually beat in the rest of the cream until smooth and slightly thickened
Divide the peanut butter cream between 8 small glasses, level and then pour the slightly cooled chocolate mixture on top; cover and chill until set for about 1 hour
To serve, top each glass with some sliced banana, a spoonful of caramel sauce and the roughly chopped peanuts, grate over the reserved chocolate
8 servings