Best Brownies
["1/2 c. butter", "2 sq. bitter chocolate", "1 c. sugar", "1 egg", "1 tsp. vanilla", "3/4 c. flour", "1 tsp. baking powder", "1 c. chopped nuts"]
["Melt butter and chocolate in a 9 x 9-inch pan.", "Add ingredients in the order given in the pan.", "Bake at 375\u00b0 for 22 minutes."]
["butter", "bitter chocolate", "sugar", "egg", "vanilla", "flour", "baking powder", "nuts"]