Mix Biscuit Crumb, 5 tbsp of powdered sugar & melted butter to make a crumbly mixture. You can reduce added sugar if you are using sweeter biscuits for crumbs. Keep aside.
Boil the whole can of Nestlé MILKMAID as it is (without opening the can) in boiling water for at least 2 hours to prepare dulce de leche i.e. caramelized form of Nestlé MILKMAID
Take out of boiling water and rest it for a few hours.
In a non-stick pan, take solid butter and prepared dulce de leche and cook together on low flame till all the butter is incorporated and a nice fluidity is achieved.
Whisk fresh cream in a bowl with 3 tbsp of powdered sugar over an ice bath until little stiff and sugar dissolves completely.
In each glass, sprinkle about 2-3 tablespoons of the crumbly mixture prepared in Step 1. Add 1 tbsp of dulce de leche layer on top. Now put some sliced banana pieces.
Top up with more crumbly mixture for extra crunch. Pour some whisked cream. Top up with dulce de layer again. Finally, garnish with grated chocolate and refrigerate for a few hours and serve chilled.