1/2 cup margarine or butter
2 cups semisweet chocolate chips
1 2/3 cups granulated sugar
1 1/4 cups all-purpose flour
2 tablespoons rum or 1 teaspoon rum extract
1 teaspoon vanilla extract
1/2 teaspoon baking powder
1/2 teaspoon salt
3 eggs
1 cup chopped nuts, if desired
Rum Frosting

Preheat oven to 350 degrees F. Grease 13 x 9-inch pan.

Heat margarine and chocolate chips in 3-quart saucepan over low heat, stirring constantly, until melted. Beat in remaining ingredients except nuts and Rum Frosting until smooth. Stir in nuts. Spread in pan. Bake about 30 minutes or until center is set; cool completely. Frost with Rum Frosting. Drizzle with melted semisweet chocolate if desired. Cut into bars.

Rum Frosting
2 cups confectioners' sugar
1/4 cup butter, softened
1 teaspoon rum or 1/2 teaspoon rum extract
1 to 2 tablespoons milk

Mix confectioners' sugar, butter and rum. Beat in milk until smooth and of spreading consistency.