I did this last night when I was making muffins, but didn't look it up online. Using the cup is genius. Some of my muffins had conical bottoms or puzzle piece sides because I just used the weight of the batter to get the liners into the muffin pan. Also, parchment paper liners come off cleaner than store bought liners. DIY Cupcake Liners Using Parchment Paper | Cooking Tips | NoshOn.It