Hang an oven thermometer in the center of the middle rack and preheat the oven to 350˚F (176.67˚C). Allow the oven to preheat for at least 20 minutes and take a temperature reading.

The easiest way to achieve this is with an oven thermometer. No, not the kind you stick in your turkey every Christmas — it's as simple as a $10 dial you place in your oven that tells you the real ...