Brownies
["1 c. margarine", "2/3 c. cocoa", "2 c. sugar", "4 eggs", "2 tsp. vanilla", "1 c. all-purpose flour", "1/2 tsp. salt", "nuts (if desired)", "chocolate chips (if desired)"]
["Preheat oven to 350\u00b0.", "Grease a 9 x 13-inch pan."]
["margarine", "cocoa", "sugar", "eggs", "vanilla", "flour", "salt", "nuts", "chocolate chips"]