Prepare brownies according to the box directions and let completely cool to room temperature.
To prepare icing, begin by beating the butter and 1 cup of sugar together. Slowly add the remaining cups. The icing should be stiff, so add the mint extract first, the food coloring and then the cream in ½ tablespoon increments until the desired consistency is reached.
Ice the cooled brownies with the creamy mint frosting, smooth out the top using an offset spatula. Freeze for 2 hours to set. Remove the brownies from the freezer.
Remove the brownies from the freezer. Place the milk chocolate chips ina small bowl and microwave in short 15 second increments until melted, do not overcook. Drizzle the melted chocolate glaze over the top. When it’s hardened, cut the brownies in serving sizes using a sharp knife, finish thawing the rest of the way and serve.
Notes
Freezing the brownies after they are iced is only for nice clean cut marks when you cut the brownies. If this doesn’t bother you, then you can skip the freezing portion and go straight to drizzling the chocolate and serving.Storage
Place brownies in an airtight container or cover with plastic wrap or aluminum foil - and refrigerate for up to 5 days.
Freeze chocolate mint brownies for up to 3 months when properly wrapped and stored to prevent freezer burn.