Things You'll Need

Step 1:

Measure the all-purpose flour into a mixing bowl. Use the same amount of all-purpose flour as the amount of cake flour indicated in the recipe.

Step 2:

Remove 2 tablespoons for every cup of flour in the bowl. For example, if the recipe requires 2 ½ cups of cake flour, remove 5 tablespoons of all-purpose flour.

Step 3:

Replace the removed all-purpose flour with 2 tablespoons of cornstarch for every 1 cup of flour. Cornstarch prevents gluten from forming, resulting in a more tender cake similar to the results achieved when baking with cake flour.

Step 4:

Whisk the all-purpose and cake flour together, combining them completely and evenly. Alternatively, sift the flour and cornstarch together in a flour sifter to mix them together. Mix and bake the cake according to the recipe.