Chocolate Brownies - cooking recipe

Ingredients

1/2 c. butter
1 sq. unsweetened chocolate
2 eggs
1 c. sugar
3/4 c. all-purpose flour, sifted (do not use pre-sifted flour, measure after sifting)
1 tsp. baking powder*
1/2 tsp. salt*
1 c. chopped walnuts
1 tsp. vanilla

Preparation

*Sift flour again after adding baking powder and salt.