"The biggest culprit in the kitchen is moisture, and it can sneak in faster than you think," Smith says. "Never measure spices directly over a steaming pot or pan. Steam will enter the container, create condensation, and cause clumping, mold risk, or flavor loss. Instead, spoon the amount you need onto a plate or into your hand, then add it to your dish. Also, make sure your measuring spoons are completely dry before dipping into any jar."