If you need cake flour and don't have any on hand, here's how to make a cake flour substitute in a pinch!
Fluff flour with spoon and spoon into measuring cup. Scrape off excess with knife.
Pour into bowl and remove two tablespoons of flour. Place back in flour bin.
Add two tablespoons of cornstarch to flour.
Sift mixture five times.
Use as directed in recipe.
Not recommended as an overall replacement — only when needed for a recipe and you can't get to the store!