The rich chocolate filling in these cookies is a "ganache," made by heating and stirring together semisweet chocolate and whipping cream until the chocolate has melted.
Use peppermint extract, rather than mint extract, for this recipe. Mint extract will not blend well with the rest of the ingredients.
Present these creamy chocolate-mint cookies in decorative 1 3/4-inch holiday-themed paper or foil cups. Look for these cups at cookware, candy-making supply and grocery stores during the holidays.