1 c. butter
4 sqs. (4 oz.) unsweetened chocolate
2 c. sugar
1 tsp. vanilla (optional)
4 eggs
1 c. flour
1 c. broken walnuts (optional)

Combine butter and chocolate in saucepan. Melt over low heat, stirring occasionally. Stir in sugar vanilla, then beat in eggs (one at a time). Stir in flour, then the nuts. Pour into a well greased 9 x 12 inch pan. Bake in preheated 375 degree oven 20 to 25 minutes. Cool and cut into squares.