Put the dulce de leche and mascarpone in a large bowl, beat until fluffy.
Separately, beat the confectionery cream and gradually add it to the other mixture. Stir carefully with a wooden spoon or spatula.
Prepare bowls and pour a few tablespoons of this mixture in them.
Crumble 4 cocoa biscuits coarsely on top and add more cream. Keep alternating until out of ingredients.
Sprinkle with a crumbled biscuit and put it in the fridge overnight.