NoteThese frosty desserts can be frozen up to 24 hours before serving. Even if you're having a small gathering, make the full dozen. The leftovers will keep, tightly wrapped, in the freezer for several days before serving.
ShortcutOmit butter. Cut 6 cookies in half as directed. Place remaining (whole) cookies in paper-lined muffin cups; top with ice cream, then continue as directed.