01 - In a mixing bowl, combine powdered sugar, unsalted butter, peppermint extract, heavy cream, and salt. Beat until a smooth, pliable dough forms. If the mixture is overly sticky, incorporate additional powdered sugar gradually until the texture is workable.
02 - Scoop out portions about 2 teaspoons each and roll into balls. Flatten each ball into a 1/4-inch thick disc using your hands or the base of a glass. Arrange discs on a parchment-lined baking sheet.
03 - Transfer the sheet to the freezer for 20 to 30 minutes until the discs become firm.
04 - Combine chopped dark chocolate and coconut oil, if using, in a heatproof bowl. Set the bowl over a pot of gently simmering water and stir until completely smooth and melted.
05 - Remove peppermint discs from the freezer. Using a fork, dip each disc in the melted chocolate, letting excess chocolate drip back into the bowl. Place coated patties back onto the parchment-lined sheet.
06 - Refrigerate the coated patties for about 15 minutes or until the chocolate is fully set.