Ingredients Sheet Cake: Nonstick baking spray 2 1/2 cups cake flour 1 teaspoon salt 1 cup buttermilk 1 teaspoon vanilla flavoring 1 teaspoon sodium bicarbonate 2 whole eggs 1 1/2 teaspoons vinegar 1 1/2 teaspoons cacao powder 1 1/2 fluid ounces red food coloring 1 cup shortening 1 3/4 cup