This sounds familiar

N.H. woman bakes cookies on dashboard

With temperatures soaring Wednesday, Fontaine placed two trays of cookie dough on the dashboard, shut the doors and retreated inside to her air conditioned office.

[...]

Fontaine first tested her dashboard oven three years ago. She said anyone can do it; the only requirement is for the outside temperature to be at least 95 degrees, so it will rise to about 200 degrees in the car. Temperatures in the area reached the mid to upper 90s on Wednesday.

"It's a car...it's a barbecue. It's the Car-B-Que." Man, a dozen (or more) years later, I still think that an oven on the engine block is a brilliant idea ;>