Tater Tot Casserole

2 lbs. extra lean ground beef (cooked and strained) 
1 can cream of mushroom soup
1 16oz Sour Cream
1 cup grated cheddar cheese (or more!)
1 pack frozen tatter tots (or 1 pkg frozen hashbrowns) 
Preheat Oven For 350 degrees. 
Grease 13x9 inch pan. 
Layer the beef on the bottom of the pan, set aside. 
In a med mixing bowl add sour cream and mushroom soup and mix well. 
Then layer the mixture on top of the beef, then add cheese. Top with tatter tots (or hashbrowns) . 
Bake covered for 45 minutes. 
Uncover and bake 15 minutes longer, adding extra cheese here if desired. Once cheese is melted you will be done.