1/4 c. butter
3/4 c. brown sugar, packed
3 eggs
1 (12 oz.) pkg. semi-sweet chocolate pieces, melted
1 tsp. vanilla
1/4 c. flour
1 c. walnuts, coarsely chopped
1 (9-inch) unbaked pie shell
Whipped cream (optional)

Cream butter with sugar, beat in eggs, one at a time. Add melted chocolate and vanilla. Stir in flour and broken walnuts, and turn into pie shell. Bake at 375 degrees for 25 minutes. Cool. Top with whipped cream, if desired.