Directions

1. Cream butter and sugar together in mixing bowl. Add eggs, one at a time, plus egg yolk and vanilla, mixing well. Fold in the flour/cocoa mixture. Add nuts.
2. Spread brownie mixture evenly in a 12 by 18 inch greased and lightly floured pan. Bake at 375 degrees F for about 20 minutes or until firm to the touch. Cool completely before cutting into 1 1/2 inch squares.