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Answered by The Community. Making the world better, one answer at a time. As a by product of the electric stove the first electric toaster oven was invented in 1910. A gentleman named William Hadawy who designed the first electric stove also invented the toaster. William developed the idea for the Westinghouse Corporation who is still a leading producer of toaster ovens today.
The temperature settings on a toaster oven reflect the same meaning as on a conventional oven. If you are preparing a product that says preheat the oven to 400 degrees, choose 400 degrees on your toaster oven the same as on you conventional oven.