Lining a pan gives it a nonstick surface. Silpats, rubberized silicone baking mats, outperform parchment and wax paper. They don't shift around, nothing sticks to them (perfect for delicate cookies), and they can be reused almost 2,000 times. Just wash in soapy water. Real Simple pick: Demarle 11-by-17-inch Silpat Baking Liner, $20, www.amazon.com.