Start by crushing the cornstarch biscuits, then transfer all the biscuit crumbs to a bowl, add the butter and mix well by hand until combined.
Transfer all of it to a 3.2L serving dish.
Using a spoon, spread the biscuit crumb mixture until flat and compact.
After that, add all the dulce the leche, spreading it out well.
Add the round slices of banana all around the edges of the dish and in the center, add the bananas chopped into smaller pieces. After that, set aside.
In a bowl, add the well-chilled heavy cream, whip it well until stiff peaks form.
Next, cover the bananas with all this whipped cream and spread it out well using a spatula.
Top it with chocolate shavings to taste.
Take to the fridge and let it chill for at least 3 hours.
Serve.