Beat 2 eggs with a pinch of salt and sugar. Pour in milk and, stirring constantly, add sifted flour, baking powder and cocoa. Mix until smooth. Then immediately pour in ½ cup of boiling water, stir and add butter.
Pour a thin layer of dough into a well-heated frying pan without oil and fry on both sides until golden. The pancakes should not be too thin, so as not to tear, but not too thick either. Also, do not fry the pancakes until they harden, because you will not be able to wrap the filling in them.
For the filling, rub the cottage cheese through a sieve and mix with vanilla, sugar and sour cream. Place a cooled pancake on the work surface and spread with the curd filling, put another pancake and more filling on top, there should be 5 layers in total.
Place the remaining filling and whole bananas on the last pancake, sprinkle with grated nuts and roll up, leave in the refrigerator for 2-3 hours.