Its a different recipe to normal yorkshires, but the huge advantage with the stoneware is that you don't need any fat. Also, you put the mix into a cold muffin pan, and then into a hot oven. I've used pampered chef stuff for years - it is expensive (but I used to be a pampered chef consultant, so got discount!) but worth it, particularly the stoneware stuff, which allows lots of low fat cookery.