1 (8 oz.) pkg. unsweetened chocolate
1 c. butter
1 1/2 c. flour
5 eggs
3 c. sugar
1 tbsp. vanilla
2 c. coarsely chopped walnuts; optional

Melt chocolate and butter in saucepan over very low heat, stirring constantly. Cool slightly.

Beat eggs, sugar, and vanilla in large mixer bowl on high speed for 10 minutes. Blend in chocolate mixture on low speed. Add flour, beating just to blend. Stir in nuts.

Spread in greased 13 x 9 pan. Bake at 375 degrees for 35-40 minutes. (Do not over bake). Cool in pan. Makes 24-32.