I got your Hob Nob biscuit recipe several weeks ago on one of the threads and tried them. They tasted lovely and were easy to make. I made them on the Friday night - and we all had a sample and they were perfect. By the next day they got really hard - we still ate them - dipped them in our tea!!. What did I do wrong. They were so nice and everyone is asking for me to make them again. Maybe I overcooked them. Any advice.