Place the brown sugar in a microwave-safe bowl
Cover it with a damp paper towel
Microwave in 10-second intervals, breaking up clumps between intervals
Put the brown sugar in an airtight container with a slice of bread overnight
Put the brown sugar in an airtight container with a damp paper towel for a few hours
Put a marshmallow in the container and seal it for several hours
Place a terracotta sugar saver in the container
Break up the hardened sugar with a fork or spoon before using
Store brown sugar in an airtight container after softening it