(Recipe can be doubled.)

1/2 c. butter
1 c. sugar
2 eggs
2 (1 oz.) sq. unsweetened chocolate, melted
1 tsp. vanilla
1/2 c. sifted flour
1/2 c. chopped walnuts (optional)

Cream butter and sugar; beat in eggs. Blend in chocolate, vanilla and flour. Add walnuts. Bake in greased 8 x 8 x 2 inch pan at 350 degrees for about 35 minutes. Cool before cutting.