Melt chocolate with butter in saucepan over very low heat; stirring constantly until smooth. Cool slightly.
Beat eggs, sugar, and vanilla in a large mixing bowl at high speed 1 min. Blend in chocolate at low speed. Add flour, beating just to blend. Stir in walnuts.
Spread in greased 13x9" pan. Bake at 375~ for 35-4 minutes. (do not overbake). Cool in pan. Cut into bars or squares. Makes 24-32
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