2 c. powdered sugar
1/4 c. and 1 tsp. butter
2 tbsp. milk
3/4 tsp. peppermint extract
1 sq. baking chocolate
Green food coloring

Mix sugar, 1/4 cup butter, milk, peppermint extract and food coloring. Spread on cooled brownies. Melt chocolate and 1 teaspoon butter. Drizzle over green frosting.