From the Test Kitchens: After reading your comments, we corrected a confusing measurement for the fluff topping. For the nougat you need 4 cups fluff (about 1 13-ounce jar or 2 7.5-ounce jars). Accurate measuring: This is often the cause of a dry or uneven result with when baking. Always use a dry measuring cup for flour. We use the spoon and level method for measuring flour, which avoids over-packing this key ingredient into the cup. Measuring or working with fluff: Lightly brush or spray the measuring cup with nonstick spray before using. The mixture will be sticky and taffy-like. It's best to work with this ingredient at room temperature. Oven temp: Make sure you have a good oven thermometer and a working timer. Always check at the low end of the baking range. Over-baking can ruin even the moistest cupcakes.