Bake sweet pancakes. Allow to cool. Peel oranges and remove fibers. Separate the pulp from the film with a knife. Add powdered sugar in a sour cream and whip into a fluffy mass. Finely grate chocolate and add to the sour cream. Stir gently. Coat one pancake with sour cream and chocolate. Put the second pancake over it. Spread sour cream and lay out orange slices. Continue piling the smeared pancakes in the same sequence until all the ingredients expire. Refrigerate for at least 2 hours.