Adding mint to your brownies makes for a cool twist. I love the combo of the colors and flavors and hope you do, too.
Grease and flour a 12 x 18-inch baking sheet. In a large mixing bowl combine sugar, flour, cocoa and salt. Mix ingredients. Pour in the melted butter and beat just until blended then add eggs and vanilla. Mix thoroughly. Pour into prepared pan and bake at 350 degrees for 30-35 minutes. Cool completely.
In the bowl of an electric mixer, beat butter until smooth. Add powdered sugar 1 cup at a time mixing after each addition. Mix in milk, green food color, peppermint flavoring. Mix to combine. Spread over cooled brownies.
In a microwave-safe bowl, add chocolate chips and butter. Cook for 70 seconds. Stir until smooth. If the chocolate is too thick, add coconut oil or shortening and stir until smooth and shiny. Cooking the chocolate mixture longer is the microwave will NOT make it smoother. Mixture may, also, be cooked over low heat in a small saucepan.