I have alot of muffin mixes that my brother gave to me as he works for a large Baking outfit here in Canada. I would like to make muffins with them, but in the past the package muffins I found are really dry. They are all Bran Muffin mixes, and I always make my own. Can someone please help me with a suggestion, I am not sure if I should add oil more water melted butter?