Emergency Ingredient Substitutions for Baking ~ useful guide to simple substitutions. has tips and suggestions about how to replace the missing ingredients successfully. Great to know for your holiday baking!
To make 1 cup of cake flour measure 2 tbsp of corn starch into a 1 cup measuring cup. Level it off the rest of the way with the bleached all purpose flour. Just make sure to whisk it thoroughly before adding it to the wet ingredients.