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

Cream butter and sugar, add eggs and beat well. Blend in melted chocolate, vanilla, and flour. Mix in nuts if desired and pour batter into a greased, 8 x 8 inch pan. Bake at 325 degrees for 30 minutes. Do not overbake!