Ingredients:

  Amount  Measure       Ingredient -- Preparation Method
--------  ------------  --------------------------------
     3/4  cup           sugar
     1/2  cup           butter -- room temperature
   2                    eggs
     1/2  cup           unbleached all-purpose flour -- sifted
   1      ounce         unsweetened chocolate -- melted
   1      teaspoon      vanilla
   1      cup           chopped walnuts or pecans -- optional

Preparation:

Preheat the oven to 350°. Lightly butter an 8-inch square pan. In a medium-size bowl, cream the sugar and butter. Add the eggs and mix well. Gradually add the flour, incorporating well. Add the melted chocolate, vanilla and nuts. Stir just to combine. Pour the batter into the prepared pan and bake for 25 minutes. Allow to cool in the pan, then cut into squares.