If you wanted to boost the heat (with an out of the box idea) and you have a 12-volt solar panel with a few watts behind it. You could use it to light up a few auto light bulbs (1156 backup bulbs would work) placed inside the oven to help generate heat.

This is only worth doing if you have the panels and are not using them for anything else at the same time.
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You can run, but you'll only die tired.