Look online for the new Reynolds Wrap liners as well as any silicone coated paper liners.
Not only functional, but they come in some beautiful colors and prints.
Greatest invention since sliced bread, IMO.
Expect to pay a bit more.
You could spray, I suppose, but then you are running the risk of a greasy result.
Another thing is to wait until the muffins are cool before attempting to "peel".
Don't know why but this seems to help.
mimi