I often get asked whether substitutions can be made in a recipe. Baking is really a sort of science
experiment, much more so than actual cooking, so while substitutions will work sometimes it is often best to simply
follow the recipe, if at all possible. I never thought to devote an entire post to the subject, instead answering
inquiries on a one-on-one basis, but Rose Levy Beranbaum finally
said what I, and other bakers, have been thinking for a long time:
Can you substitute ingredients? Yes. Should you? Usually, no.
There are many parts of recipe for breads, cookies and cakes that cannot change without fundamentally altering the
final product. For example, if a recipe calls for baking powder you cannot substitute yeast. They may both be
leaveners, but they are completely dissimilar. You could try to substitute whole wheat flour for all purpose, but the
outcomes will not be identical because the properties of each type of flour are different. Flavorings and add-ins, like
chocolate chips, blueberries, nuts or vanilla extract, can be substituted for other, similar ingredients, but the
mainstays of a recipe should not be changed if you are expecting to reproduce the outcome of the original recipe. Rose
suggests changing one ingredient at a time, if you really want to experiment, and watching the results. You might not
get edible cookies, but you will gain a better understanding of how your ingredients work should you want to make
changes in the future. Websites like FoodSubs.com can help, but if you want
chocolate cake right now, try to stick with the recipe for the best results.