You can always use paper fillings to make the muffins have a good shape; however, I think muffins looked better naked. You can see all that’s inside and it looks homemade and rustic, which I really like. But, when you don’t use the paper it is sometimes difficult to get the perfect shape; here’s what I have learned.
When you put too much non-stick spray on the sides, the muffins will form a lip all the way around the top when they cool. I honestly don’t know why that happens, but what I do know is if you only spray the bottom of the muffin pan, this will not happen. If you do have trouble getting the muffins out, scrape a knife around the edge and flip the muffin pan over. The muffins just fall right out.