01 - In a mixing bowl, combine powdered sugar, unsalted butter, peppermint extract, heavy cream, and salt. Beat with an electric mixer or sturdy spatula until a smooth, pliable dough forms. If the mixture is too sticky, add additional powdered sugar by the tablespoon until workable.
02 - Scoop approximately 2 teaspoons of filling and roll into balls. Flatten into 1/4-inch thick discs and place onto a parchment-lined baking sheet. Freeze for 20 to 30 minutes until firm.
03 - Place dark chocolate and coconut oil, if using, in a heatproof bowl set over a pot of simmering water. Stir regularly until fully melted and smooth.
04 - Using a fork, dip each chilled peppermint disc into the melted chocolate, ensuring an even coating. Allow excess chocolate to drip back into the bowl before returning disc to the lined baking sheet.
05 - Transfer the chocolate-coated patties to the refrigerator and chill for 15 minutes, or until chocolate is firm and set.