Line an 8x12-inch casserole (or two smaller Corning Ware casseroles), or 7x11-inch pan with the potato rounds, on the bottom and sides (I use a little more ingredients, doubling the soup and make a heaping 9x13-inch).
Bake 10 minutes at 400°F.
Add broccoli, tomatoes, HALF the onion rings, and add to the cooked ground beef and spread on top of cooked tater tots.
Mix soup, milk, half the cheese and seasonings and pour over beef mixture.
Fill casserole dish and bake covered (or it will dry out) at 400°F for 20 minutes.
Remove cover and add rest of cheese and dried onions.