Luck O' the Irish Bars
1. Preheat the oven to 350 degrees F (175 degrees C). Grease a 9x13 inch baking dish.
4. To make the middle layer, beat 1/2 cup of butter with confectioners' sugar in a large bowl using an electric mixer. Add milk as needed to get a spreadable consistency. Stir in the peppermint extract and green food coloring. Spread this over the cooled pan of brownies. Refrigerate for 30 minutes