No-Fat Frozen Yogurt Cake Roll
["1/2 c. flour", "1/4 c. cocoa", "1 tsp. baking powder", "1/8 tsp. salt", "8 oz. egg whites", "2/3 c. sugar", "1 tsp. vanilla", "1/2 gal. no-fat frozen yogurt (any flavor)"]
["Mix together the first 4 ingredients.", "Beat the next 3 ingredients with mixer until thickened.", "Sprinkle flour mixture over egg mixture.", "Using rubber spatula gently fold together. Bake 400\u00b0", "for 10 to 12 minutes in jelly roll pan lined with wax paper sprayed with cooking spray.", "Invert cake on powdered sugar sprinkled towel and roll up quickly.", "Cool completely on wire rack."]
["flour", "cocoa", "baking powder", "salt", "egg whites", "sugar", "vanilla", "frozen yogurt"]