Eileen, I found this on my package of brown sugar yesterday as I was using the last of it and remembered your post. It uses unsweetened chocolate tho, not semi-sweet.

BROWN SUGAR BROWNIES

1 cup packed dark brown sugar
1/2 cup (1 stick) butter or margarine, softened
2 eggs
2 ounces (2 squares) unsweetened chocolate, melted
1/2 cup all-purpose flour
1 cup coarsely chopped walnuts

Preheat oven to 325 degrees F. Grease an 8x8x2-inch baking dish.

In a large bowl beat sugar and butter until fluffy.

Beat in eggs, one at a time. Beat in chocolate, then flour. Stir in nuts. Pour into prepared baking dish.

Bake 25 minutes. Cool in pan.

Cut into bars. Dust with powdered sugar.

Makes 2 dozen bars