Place chocolate chips, salt and vanilla in blender, blend on low speed 30 seconds.  Add boiling cream; blend 30 seconds.  Add egg yolks all at once, blend 5 seconds.  Add a small amount of the chocolate mixture to the beaten egg whites.  Carefully fold in remaining chocolate mixture.  Refrigerate filling 2 - 3 hours or until set.  To assemble crepes, place 1 heaping tablespoon of filling on the center of each crepe.  Fold side over.  Place on waxed paper-lined cookie sheet, cover tightly.  Freeze until ready to serve.