Heat oven to 350º
Microwave butter in large bowl until hot and melted. Stir in cocoa powder until completely dissolved. Set aside.
Beat eggs, sugar and vanilla in large bowl with electric mixer on high speed 2 minutes. Reduce speed to low, beat in chocolate mixture until well blended. Beat in flour just until blended. Stir in walnuts.
Spread in greased 13x9 inch baking pan. Bake 35 minutes or until toothpick inserted in center comes out with fudgy crumbs.
Do not overbake!
Cool in pan. Cut into squares
Recipe submitted by John on 11/8/00