Name: Lucky Irish Brownies
Prep time: 1 h 35 min
Cook time: 1 h 35 min
Total time: 1 h 35 min
Yield: 12
Ingredients: 4 (1-ounce) squares of unsweetened chocolate; 1 cup margarine, softened; 2 cups white sugar; 3 eggs; 2 1/2 teaspoons plus 1 tablespoon vanilla extract, divided; 1 cup all-purpose flour; 1/2 cup plus 6 tablespoons butter, softened; 4 cups confectioners' sugar; 2 tablespoons milk, or as needed; 1 1/2 teaspoons peppermint extract; 6 drops green food coloring, optional; 1 1/3 cups semisweet chocolate chips