Chocolate Peppermint Sandwich Cookies

More addictive than Oreos, these are confected by sandwiching crisp chocolate wafers with either peppermint buttercream or a butterless peppermint filling based on egg white. The secret of making the cookies sufficiently thin is an easily improvised mold that bypasses the problem of cutting very thin slices from a free-form roll of dough. For this recipe, two cans of the size used for Campbell’s condensed soups are just right. Be sure that the top and bottom have been taken off smoothly, wi