01 - Combine powdered sugar, unsalted butter, peppermint extract, heavy cream, and salt in a mixing bowl. Beat with an electric mixer or sturdy spatula until a smooth, pliable dough forms. If necessary, adjust texture by gradually adding more powdered sugar to prevent stickiness.
02 - Portion out small balls of dough, approximately 2 teaspoons each. Flatten balls into 1/4-inch thick discs and arrange on a baking sheet lined with parchment paper. Freeze discs for 20 to 30 minutes until firm.
03 - Place chopped dark chocolate and coconut oil (if using) in a heatproof bowl set over a pan of simmering water. Stir continuously until chocolate is melted and smooth.
04 - Using a fork, dip each chilled peppermint disc into the melted chocolate. Allow excess chocolate to drip off, then return coated discs to parchment-lined baking sheet.
05 - Chill the coated patties in the refrigerator for 15 minutes or until the chocolate is fully set.