How can I stop everything I cook from burning underneath ?

Sue, won't double baking trays retain more heat? No oven is an exact temperature, there will be variations- the engineer I have calls it factory tolerance. Try reducing the temperature from your recipe by a few degrees and and make sure there's nothing on the clean oven floor (spare baking sheets, etc). Moving the item lower down in thew oven may also help.

carin
January 2009