I used paper liners instead of greasing the muffin tins. Unfortunately, the muffins stuck to the liners! What do you think happened?

    There are a couple of reasons for this:

    1) If you try to peel off the wrapper while the muffins are still warm
    2) If you make it low-fat or fat free 3) If you don't lightly grease the liners with non-stick cooking spray.