01 - Sift the icing sugar into a large mixing bowl.
02 - Add the egg white or aquafaba and peppermint extract, mixing with a wooden spoon until a stiff, smooth paste forms.
03 - Dust a clean surface with icing sugar, turn out the paste, and knead gently until smooth.
04 - Roll the paste to approximately 1/2 inch thickness.
05 - Using a small round cutter about 1 1/4 inch in diameter, cut out circles and place on a baking tray lined with parchment paper.
06 - Let the shapes dry at room temperature for at least one hour until firm to the touch.
07 - Dip half of each piece in melted dark chocolate and return them to the tray to set.