We LOVE us some tater tot casserole! Here's our version (well at least our current version. It is CONSTANTLY changing.):
Brown 3lbs of ground beef.
Mix in 2 big cans of Cream of Mushroom Soup.
Add 1 small bag of frozen corn.
Pour that mixture into the bottom of 2 9x13 pans.
Cover it with American cheese or shredded cheddar.
Cover with a single layer of tater tots.
Bake at 350 for 30 minutes.