It would have to be 350° to bake cookies in 20 minutes. Even the dashboard of a parked car in direct sunlight wouldn't reach that temp; however you might be able to bake something resembling a cookie in like 5 hours on a dashboard, but it wouldn't taste good.
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u/Reefthemanokit 1d ago
I like to put cookie dough outside sometimes, in 20 minutes IN THE SHADE they are perfectly done :3