Intensely Deep Dark Chocolate Brownies - cooking recipe

Ingredients

1 cup unsalted butter
8 ounces bittersweet chocolate (fine quality, no more than 60% cacao)
2 cups sugar
1 teaspoon vanilla extract
5 large eggs
2/3 cup all-purpose flour
1/3 cup unsweetened dutch cocoa
1/2 teaspoon salt
3/4 cup walnuts, chopped (optional)

Preparation

Preheat oven to 350 degrees F with rack in center position.
Butter and flour 13\" x 9\" pan.
In 3 qt heavy saucepan, melt butter and chocolate over low heat, stirring until smooth.
Remove from heat and allow to come to room temperature.
Whisk in sugar and vanilla into chocolate/butter combination.
Whisk in eggs, one at a time until thoroughly combined. Set aside.
In separate bowl combine Dutch process chocolate powder, flour and salt.
Combine flour mixture with chocolate/butter and whisk thoroughly.
Add chopped walnuts if using.
Spread brownie batter in pan and bake for 25-35 minutes.
Cool completely.