That is a Crock Grill with the burner and grill missing. I had one back in the early 2000s. The hole is for where the burner plugs into the power supply/thermostat thing. Was actually a great cooking implement, and you should try to find the rest of the parts.
Edit : heres a link to an eBay listing of the model I had.
People just can't resist the urge to say something, even if it's useless. Especially if it's useless. (Even me, here I am saying something.)
But in this particular community, if you don't actually know with certainty what something is it doesn't seem to hard to just shut the fuck up. There's no value whatsoever in conjecture. I had no idea what the hell this thing was but I was interested to find out, but I sure as hell didn't feel the need to speculate...
Eh, guessing is fun and you could only know by having had one. I did enjoy just how silly some of the wrong answers were. This might be the first time I was the only one who knew a thing, too, so that was cool.
The inset ridge at the top makes me think maybe it had a lid at one point? Looks like you could cook a turkey in it, I wonder if it was itself a small electric oven, but now is missing the lid, rack, and heating element? That would explain the hole and the size.
The feet on the bottom really don't seem practical for an oven rack, completely unnecessary if that's what it's for.
Some people say handle. I think it’s to have an electronic device slotted in to do something inside while it’s in the oven. Not sure it was intended for baking food.
Are you sure it’s a food item? It this was used as an electrical insulator, it could have trace amounts of highly toxic and carcinogenic oil. I would not use it for anything before positively identifying it.