Mix the cream, cream cheese, and sugar until smooth.

Add a little milk and coffee to make the mixture slightly thinner so it can be easily spread over the biscuits.

Dip the ladyfingers in coffee and arrange them in a dish.

Spread a layer of the cream mixture over the biscuits.

Add sliced bananas and chopped walnuts on top of the cream layer.

Repeat the layers.

Finally, cover the top of the tiramisu completely with cocoa powder.