Brownies with Creme de Menthe-Chocolate Chip Frosting Ingredients Brownies 1 1/2 sticks butter 4 ounces unsweetened chocolate, chopped 4 large eggs 1 3/4 cups sugar 1 1/2 teaspoons vanilla extract 3/4 cup all-purpose flour 1 cup semi-sweet chocolate chips Frosting 1/2 cup butter, softened 4 cups powdered sugar 3 tablespoons green creme de menthe 3