Preheat oven to 350 degrees. Line an 8 x 8 baking dish with enough aluminum foil to have some hang over the sides. Grease and flour the aluminum foil.

Melt butter in a saucepan over medium heat. Once melted allow to cool completely.

Once cool, whisk in cocoa powder. Whisk in sugar. Once mixed, whisk in eggs one at a time. Whisk in vanilla. Add in flour and salt and mix just until combined. Don't over mix.

Spread half of the brownie batter on the bottom of the prepared pan. Scatter Mint Truffle Kisses over the top. Top with remaining brownie batter. Bake in preheated oven for 20 - 25 minutes or until a toothpick inserted comes out clean. Place on cooling rack to cool completely.

Meanwhile make buttercream by creaming together butter and powdered sugar for about 2 minutes. Beat in cocoa powder and vanilla. Beat in milk one tablespoon at a time until a stiff but spreadable mixture forms. Spread frosting on the top of the cooled brownies. Cut into 16 brownies and serve.