Best All-American Brownies
["1/2 lb. butter", "1 1/4 c. flour", "3/4 c. cocoa", "3/4 tsp. baking powder", "1/2 tsp. salt", "3 eggs", "1 1/2 tsp. vanilla", "2 c. sugar"]
["Heat oven to 325\u00b0.", "Butter 13 x 9-inch pan.", "Soften butter. Combine flour, cocoa, baking powder and salt.", "Beat eggs, vanilla and sugar.", "Add butter.", "Beat in flour mixture.", "Spread batter into pan.", "Bake 30 to 35 minutes."]
["butter", "flour", "cocoa", "baking powder", "salt", "eggs", "vanilla", "sugar"]