How to make
On paper towels or foil, arrange three biscuits horizontally after dipping each in preheated milk, which you've sweetened with the sugar.
Arrange 3 more lines of biscuits parallel to it, so that you end up with a rectangle 3 biscuits wide and 4 biscuits long. Beat the cream and smear the arranged biscuits with 1/2 of it. Arrange the remaining biscuits on top of them in the same order, also dipped in milk.
Brush again with cream and put the peeled banana in the middle. Raise the paper’s left and right ends with the biscuits along the edges and bring them together to form a triangular roll.
Brush the outside with cream. Decorate with colored sugar sprinkles and refrigerate for at least two hours in the refrigerator.