Easy Cocoa Cake
["1 1/2 c. all-purpose flour", "1 c. sugar", "1/4 c. cocoa", "1 tsp. baking soda", "1/2 tsp. salt", "1 c. water", "1/4 c. plus 2 Tbsp. vegetable oil", "1 Tbsp. white vinegar", "1 tsp. vanilla", "2 Tbsp. powdered sugar"]
["Heat oven to 350\u00b0.", "Grease and flour 8-inch square or 9-inch round baking pan.", "In a large bowl, combine flour, sugar, cocoa, baking soda and salt.", "Add the water, oil, vinegar and vanilla. Beat with spoon or wire whisk until batter is smooth and well blended."]
["flour", "sugar", "cocoa", "baking soda", "salt", "water", "vegetable oil", "white vinegar", "vanilla", "powdered sugar"]