Zingerman'S Magic Brownies - cooking recipe

Ingredients

13 tablespoons butter
6 1/2 ounces unsweetened chocolate
1 1/2 cups cake flour or 1 1/2 cups all purpose flour
3/4 teaspoon baking powder
1/2 teaspoon salt
4 eggs
2 cups sugar
1 1/4 teaspoons vanilla
1 cup coarse chopped walnuts, toasted

Preparation

Grease a 13x9x2 inch baking pan. Preheat oven to 325.
In a heavy small saucepan, heat the butter and chocolate over low heat, stirring, till chocolate is melted and smooth; set aside to cool.
In a small bowl sift together flour, baking powder and salt.
In a large mixing bowl, beat eggs and sugar with an electric mixer on high speed for 5 minutes or till light yellow and fluffy, scraping side of the bowl occasionally.
Add cooled chocolate mixture and vanilla. Beat on low speed until combined. Add flour mixture; beat on low speed until combined, scraping sides of bowl. Stir in walnuts.
Spread batter in pan. Bake 30 minutes or until brownies appear set. Cool in pan on wire rack; cut into bars.