Hi Angela,

There are many different possibilities that can cause this issue. From a faulty thermostat, to placement of the food in the oven, or not giving the oven enough time to pre-heat before placing your food item in the oven to be cooked. I have found that on many ovens they can reach well over 450 degrees during the pre-heating cycle. I had a customer who called because her new oven was burning her brownies on the outside and they were not done on the inside. The customer told me that she would wait for the pre-heat signal beep(oven is ready) before putting the tray of brownies in the oven. When I initially checked the oven tempature using a fluke meter and a thermocouple at the center of the oven I found that the oven was close to 460 degrees when the beep went on to indicate the oven is ready! So that is why she was burning her brownies. It took another 10 minutes after that for the oven to stabalize and keep the tempature at 350. So you might want to give your oven 20 or 30 minutes of pre-heating time before you put your tray of Lasagna in the oven. Always make sure to place the food item at the center most part of the oven. And if you are cooking several trays make sure to stagger their position on each rack so they are not right above/below each other. The positioning is important because it can interrupt the natural flow of heat in the oven. So if you let it pre-heat for a half hour and are still having the burning issue then you should have the oven tested for proper calibration to make sure the thermostat is working properly.