"What is the right way to measure flour and why does it matter?"
Flour is pre-sifted and often does not need to be sifted at home. For best results, first fluff the flour, while still in the container, by stirring it briefly with a spoon. Then spoon the flour into a dry cup measure, overfilling the cup so you can scrape off the excess with the flat top edge of the knife. When you measure flour this way, one cup weighs 4 ounces. (If you scoop flour into the cup from your container, it can weigh as much as 5 ounces).
Measuring flour by the right method not only ensures you use the right amount, but also that the flour is aerated enough to easily mix with your other ingredients. For more tips on the correct way to measure flour, see our How-To video.