Best Brownies
["1 c. butter", "1 c. brown sugar", "1 c. sugar", "1 c. cocoa", "4 eggs", "1 c. flour", "2 tsp. baking powder", "2 tsp. vanilla", "1 c. chopped nuts (optional)"]
["Preheat oven to 325\u00b0.", "In mixing bowl, beat butter, sugars and cocoa until well blended.", "Beat in eggs, one at a time."]
["butter", "brown sugar", "sugar", "cocoa", "eggs", "flour", "baking powder", "vanilla", "nuts"]