Here is a simple one from my grandma when I was first married 45 years ago
Hamburger - browned
One can green beans drained
Dump both in casserole dish, mix up a bit
Dump on one can cream of chicken soup
Then put tater tots on top to make it look nice
Bake an hour at 350
These days I might test browning the hamburger and maybe add some onion
Then in the same iron skillet add the beans and soup. I think I would cook it until it is bubbly then add the tater tots and put it low under the broiler in the oven... I think as soon as the tater tots are done it could be eaten.