01 -
Lightly grease an 8×8 inch baking dish and set aside.
02 -
In a double boiler or heatproof bowl over simmering water, melt dark chocolate chips and 1/2 cup unsalted butter until smooth.
03 -
Remove from heat; stir in graham cracker crumbs and sweetened coconut flakes until well blended.
04 -
Press mixture firmly into the bottom of the prepared dish. Refrigerate for 30 minutes until set.
05 -
In a mixing bowl, combine powdered sugar, softened butter, cornstarch, peppermint extract, and milk. Beat until smooth and creamy.
06 -
Evenly spread the mint filling over the cooled base layer. Refrigerate for 30 minutes to firm up.
07 -
In a heatproof bowl over simmering water, melt dark chocolate chips (from base ingredient list, reserve for topping), 3 tablespoons unsalted butter, and vanilla extract until smooth. Do not overheat.
08 -
Spread the melted chocolate mixture evenly over the chilled mint layer.
09 -
Allow to cool for 15 minutes. Cut into squares and serve.