Brown your pound of ground beef and drain.
In a separate bowl mix together your beef, mushroom soup, and onion.
Spread the mixture into the bottom of an 8x8 casserole dish, evenly layered.
Place a layer of tater tots covering the top.
Bake at 350 degrees until tater tots start to brown.
Add a layer of cheese and finish baking until cheese melts.
This dish makes enough for a family of 3, with just a bit leftover. If you are making for a larger family or guest I would recommend doubling the recipe and using a 9x13 inch casserole dish.