Classic Cake-Like Brownies - cooking recipe

Ingredients

2 sq. (1 oz. each) unsweetened chocolate
2/3 c. sifted all-purpose flour
1/2 tsp. baking powder
1/4 tsp. salt
1/4 c. (1/2 stick) butter, softened
1 c. sugar
2 eggs, separated (at room temperature)
1/4 c. milk
1 tsp. vanilla
1/2 c. broken walnut pieces

Preparation

Preheat oven to 350\u00b0.
Melt chocolate in top of double boiler over simmering water.
Remove and cool to room temperature.