Butterscotch Brownies
["1/2 c. butter or margarine", "2 c. brown sugar (1/2 dark, 1/2 light)", "2 eggs", "1 tsp. vanilla", "2 c. flour", "1/4 tsp. salt", "2 tsp. baking powder", "1/2 to 1 c. walnuts, broken up"]
["Sift together the flour and baking powder; set aside.", "Cook butter and sugar over low heat, stirring until bubbly.", "Remove from heat; cool to lukewarm.", "Add eggs, one at a time, beating well each time.", "Add vanilla.", "Add sifted ingredients and nuts; mix well (the batter will be quite stiff).", "Spread in greased pan. Bake in preheated oven (350\u00b0) for about 25 minutes.", "Cut while still warm."]
["butter", "brown sugar", "eggs", "vanilla", "flour", "salt", "baking powder", "walnuts"]