01 - In a mixing bowl, beat together powdered sugar, unsalted butter, peppermint extract, heavy cream, and a pinch of salt until a smooth, pliable dough forms. If the mixture is too sticky, gradually incorporate additional powdered sugar until manageable.
02 - Portion out small balls of dough, using about 2 teaspoons for each, and shape into 1/4-inch thick discs. Arrange the discs in a single layer on a parchment-lined baking sheet.
03 - Freeze the shaped discs for 20 to 30 minutes until they are firm to the touch.
04 - Melt the chopped dark chocolate and coconut oil (if using) in a heatproof bowl set over a pot of gently simmering water, stirring until completely smooth.
05 - Working with one disc at a time, use a fork to coat each peppermint disc in the melted chocolate, allowing the excess to drip off before returning to the parchment-lined sheet.
06 - Chill coated patties in the refrigerator for about 15 minutes or until the chocolate has set.