what's the best shortening to use when baking moist muffins--oil or butter?

I use real butter in my muffins. I think they end up with a better flavor with butter than with oil or shortening. Make sure you melt the butter first though.

I like to use oil my muffins always turn out moist and another secret for moist muffins,cakes is not cook them as long as it says take out a little bit before time is up.

Probably oil is better. It should help them be moist. Olive oil is better for you but not necessarily better to use! I gues you need to try a batch and divide it up and use the different items to see which turns out better.

Butter are good for muffins for it gives creaminess in texture. But, it can affect the consistency of the muffin when mixed with other wet ingredients. It can be too soft or to dry when cooked. To make your muffin moist, you must check again your measurements used. Then, when beating time for mixture it must be only done in a time said not excess for it will also dry your muffins when cooked. The butter had been absorbed too much by the ingredients before baking time. Time preparations are important for this kind of products.It must be at fast and will not stay uncooked for a long time.