01 - In a mixing bowl, beat powdered sugar, unsalted butter, peppermint extract, heavy cream, and salt together until a smooth, pliable dough forms. If the dough is overly sticky, gradually incorporate additional powdered sugar until workable.
02 - Using approximately 2 teaspoons per portion, form dough into small balls and flatten into discs about 1/4 inch thick. Arrange on a parchment-lined baking sheet.
03 - Place the baking sheet in the freezer for 20 to 30 minutes, until discs are firm.
04 - In a heatproof bowl set over a pot of gently simmering water, melt chopped dark chocolate with coconut oil if using, stirring until completely smooth.
05 - Using a fork, dip each chilled peppermint disc into the melted chocolate, allowing excess chocolate to drip off before returning to the lined baking sheet.
06 - Transfer coated patties to the refrigerator and chill for 15 minutes or until chocolate is set.