I have not used store-bought brown sugar in about two years; it gets dry, clumpy and frustrating to work with. I now make my own brown sugar. Homemade brown sugar stays moist, it still clumps a little but since it stays moist the clumps are easy to smooth.
Brown sugar is just a mixture of white sugar and molasses. I love the flavor of molasses so I mix one part molasses to three parts white sugar. This mixture makes “dark brown sugar”. I have heard that light brown sugar is supposed to be about one cup of sugar mixed with 1 tablespoon of molasses. I encourage you to play around with it and find the mixture that you prefer. Once you start mixing the ingredients together large clumps will form.
It does take some work to get the brown sugar to the right consistency, but I promise you will be much more satisfied with the homemade version.
Homemade Brown Sugar
4 Cups White Granulated Sugar
1/3 Cup Unsulphured Molasses
1. Mix with a wooden spoon until you reach desired consistency.
2. Store in an airtight container.