16BAKING(continued)PreheatingPreheat the oven if the recipe calls for it. Preheatmeans bringing the oven up to the specifiedtemperature before putting the food in the oven.To preheat, set the oven at the correct temperature—selecting a higher temperature does not shortenpreheat time.Preheating is necessary for good results when bakingcakes, cookies, pastry and breads. For most casserolesand roasts, preheating is not necessary. For ovenswithout a preheat indicator light or tone, preheat 10minutes. After the oven is preheated place the foodin the oven as quickly as possible to prevent heatfrom escaping.Pan PlacementFor even cooking and proper browning, there must beenough room for air circulation in the oven. Bakingresults will be better if baking pans are centered asmuch as possible rather than being placed to the frontor to the back of the oven.Pans should not touch each other or the walls of theoven. Allow 2 to 4 cm (1 to 1 1⁄ 2″) space between pansas well as from the back of the oven, the door and thesides. If you need to use two shelves, stagger the pansso one is not directly above the other.Baking GuidesWhen using prepared baking mixes, follow package recipe or instructionsfor best baking results.CookiesWhen baking cookies, flat cookie sheets (withoutsides) produce better-looking cookies. Cookies bakedin a jelly roll pan (short sides all around) may havedarker edges and pale or light browning may occur.Cookies can be baked on several shelves at the sametime but browning may be uneven because of reducedair circulation.Do not use a cookie sheet so large that it touchesthe walls or the door of the oven.Aluminum FoilNever entirely cover a shelf with aluminum foil.This will disturb the heat circulation and result in poorbaking. A smaller sheet of foil may be used to catch aspillover by placing it on a lower shelf severalcentimeters below the food.Do not put aluminum foil on the oven bottom.