Devil's Advocate
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I've had gooey French toast on Amtrak and when I asked about it they said the griddle was broken.I don't often prepare frozen French Toast for myself, but I have never experienced a "gooey mushy mess" when I did.
I believe it's normally a combination of convection heating followed by a griddle finish.I think DA was saying the French toast on the Amtrak dining cars is usually thrown on the grill for re-heating? I’m pretty sure that’s how the burgers are cooked as well.