01 - Combine powdered sugar, softened butter, peppermint extract, heavy cream, and a pinch of salt in a mixing bowl. Beat until a smooth, pliable dough forms, adding extra powdered sugar if the mixture is sticky.
02 - Scoop out 2 teaspoons of the dough for each piece and flatten into discs about 1/4 inch thick. Place on a parchment-lined baking sheet.
03 - Freeze the peppermint discs for 20 to 30 minutes until firm.
04 - In a heatproof bowl set over simmering water, melt the chopped dark chocolate with coconut oil if using. Stir until smooth and fully melted.
05 - Using a fork, dip each chilled peppermint disc into the melted chocolate, allowing excess to drip off. Return coated discs to the prepared baking sheet.
06 - Refrigerate the patties for 15 minutes or until chocolate is firm and set.