6 oz. good quality chocolate plus 6 oz.
3 tbsp. butter
3/4 c. sugar
3 1/2 tbsp. water
2 eggs
3/4 c. flour
2 c. chopped walnuts (optional)

Heat oven to 325°F. In medium saucepan, combine 6 ounces chocolate with butter, sugar and water. Cook over low heat, stirring, until melted. Set aside to cool. Break up remaining chocolate and stir into melted chocolate mixture. Whisk in eggs, flour and salt. Add walnuts, if desired. Batter will be thick and lumpy. Spray a 9-inch square pan with nonstick spray and spread mixture into pan.

Bake 30 to 35 minutes. Set on rack to cool. Garnish with powdered sugar, if desired.