Low-Fat Brownies
["1/2 c. cake flour, sifted", "1/2 c. unsweetened cocoa powder", "1/4 tsp. salt", "2 egg whites", "1 large egg", "3/4 c. granulated sugar", "6 Tbsp. unsweetened applesauce", "2 Tbsp. vegetable oil", "1 1/2 tsp. vanilla extract", "1 Tbsp. chopped walnuts (optional)"]
["Preheat oven to 350\u00b0.", "Spray an 8-inch square baking pan with vegetable cooking spray and set aside."]
["cake flour", "cocoa", "salt", "egg whites", "egg", "sugar", "unsweetened applesauce", "vegetable oil", "vanilla extract", "walnuts"]