01 - In a mixing bowl, beat together powdered sugar, unsalted butter, peppermint extract, heavy cream, and salt until a smooth, pliable dough forms. If the mixture is too sticky, gradually incorporate additional powdered sugar to achieve the desired consistency.
02 - Portion the dough into small balls, approximately 2 teaspoons each, and flatten to 1/4-inch thick discs. Transfer the discs to a parchment-lined baking sheet and place them in the freezer for 20 to 30 minutes, or until firm.
03 - Combine chopped dark chocolate and coconut oil, if using, in a heatproof bowl set over simmering water. Stir gently until the chocolate is completely melted and smooth.
04 - Using a fork, dip each chilled peppermint disc into the melted chocolate, allowing excess chocolate to drip off. Return coated discs to the parchment-lined baking sheet.
05 - Chill the patties in the refrigerator for 15 minutes, or until the chocolate coating is set.