01 - In a mixing bowl, beat together powdered sugar, unsalted butter, peppermint extract, heavy cream, and salt until a smooth, pliable dough forms. If too sticky, gradually add more powdered sugar until workable.
02 - Portion out small balls of the mint dough, approximately 2 teaspoons each, and flatten into 1/4-inch thick discs. Arrange on a parchment-lined baking sheet.
03 - Place the baking sheet in the freezer for 20 to 30 minutes, allowing the discs to firm up.
04 - Melt dark chocolate and coconut oil, if using, in a heatproof bowl set over a simmering pot of water, stirring until completely smooth.
05 - Using a fork, immerse each chilled peppermint disc into the melted chocolate, letting excess drip off. Return coated patties to the parchment-lined sheet.
06 - Refrigerate the finished patties for 15 minutes, or until the chocolate has set completely.