How to Make Cake Flour

How to Make Cake Flour 2 tablespoons cornstarch 1 cup all-purpose flour Measure 1 level cup of all-purpose flour, remove 2 tablespoons of the flour and then place the flour into a bowl. Add 2 tablespoons of cornstarch to the all-purpose flour. Whisk together to combine and use as a substitute for 1 cup cake flour.