Moldy food left in oven, safe to cook? So we cooked some corn a couple weeks ago, left extras in the oven. Fast forward to tonight, I discovered we left it there. The pan it was sitting on was white as a ghost. Tossed that pan.

Is it safe to throw new food in there and cook it? I already got a cassarole baking now. Is it ruined? Only thing I can think would be mold spores, but 400F should kill them.

p.s. I'm paranoid about this stuff, sorry.
You will have mold spores in your oven, but the temperature will take care of them. All it means is that you might have some mold spore dust on your food later, which you won't even notice and is perfectly safe. Next time give your oven a good wipe-down with a damp towel before using it again. 

There's no need to toss a pan after that sort of thing, just clean it with soapy water and it should be good to go.