For this test, take an entire loaf of white bread and spread out the pieces in a grid on the racks in the oven. Once cooked, pull the bread out of the oven and check for uneven browning. The grid will show you exactly which spots in the oven are cooking more than others, which will help you pinpoint the problem.

Reasons:

• Faulty bake or broil element
• Faulty temperature sensor
• Some ovens simply cook differently