Using Aluminum Foil to line baking sheets and pans is a great way to guarantee an easier cleanup — and may help reduce the frequency needed to clean your oven. After baking cookies, breads or other foods, you can simply slide or lift the foil from the pan to remove baked items.
Aluminum foil has a shiny and dull side because of the way it’s manufactured, but which side faces up depends on its use. Non-stick aluminum foil has a non-stick coating applied to the dull side, so face this side up when baking stickier foods. Otherwise, you can help promote browning on certain foods by facing the dull side down.