Preheat the food to be baked first, and put a tray under it. Westinghouse WTO252 1j electric oven should be preheated for 3 to 5 minutes, and then the food to be baked should be put into Westinghouse WTO252 1j electric oven. Because many foods are baked with oil, oil may drip on the heating tube, so when using it, add a tray to catch the dripping oil, wait for a while to observe the changes of ingredients, and then open it and take it out when the ingredients are ready.