Have you ever had a cake recipe that called for parchment paper at the bottom of your cake pan to avoid sticking? In culinary school, every cake we made was lined with parchment paper because a cake that was stuck to a pan is a cake that can't be sold. For me, lining cake pans with parchment paper became a habit. So, to this day I always line my cake pans with parchment paper to ensure that my cakes come out easily.
It's easy to line square and rectangle pans with parchment paper, but circles were a little more tricky. You could trace your cake pan with a pencil on the bottom side of the parchment paper then cut it out. But, here is a quicker and easier method for making parchment paper lining for circular cake pans.