01 - Combine powdered sugar, unsalted butter, peppermint extract, heavy cream, and a pinch of salt in a mixing bowl. Beat with an electric mixer or sturdy spatula until a smooth, pliable dough forms. Gradually add more powdered sugar if needed until the texture is workable.
02 - Scoop 2 teaspoons of dough for each piece, rolling into balls and flattening each to a 1/4-inch-thick disc. Arrange them evenly on a baking sheet lined with parchment paper.
03 - Transfer the baking sheet to the freezer and chill the discs for 20 to 30 minutes, or until firm.
04 - Melt chopped dark chocolate and coconut oil, if using, in a heatproof bowl set over gently simmering water. Stir frequently until the chocolate is fully melted and smooth.
05 - Using a fork, dip each peppermint disc into the melted chocolate, allowing excess chocolate to drip off. Place the coated patties back onto the parchment-lined baking sheet.
06 - Refrigerate the chocolate-coated patties for 15 minutes or until the chocolate is completely set.