1 package frozen hashbrowns (I alternate between preferring the shredded and the little cubes, shape really doesn't matter)
2 cups shredded cheese (growing up it was almost always mild chedder, but now I generally prefer a blend like colby jack)
1/2 cup onion diced very fine (this was not a part of it growing up but I prefer it now. If you would rather you can use a little onion powder, trust me!)
1 can cheddar cheese soup (or cream of whatever. growing up it was always cream of chicken)
16 oz sour cream
Mix everything together and put into a greased casserole dish. Feel free to top with extra cheese, bread crumbs, potato chips, or whatever else you think would be tasty if you think it needs a little something extra. (I personally don't, although next time I might have to put some of those fried onions from a can on top, just to see what it does for me!)
Bake at 350 degrees for about 45 minutes. It makes excellent leftovers.
I suppose if you really wanted you could add some chicken or turkey and a few veggies for an easy-cheesy casserole, but I'm not sure I would want to mess with this greatness. Throw a few chicken breasts on the grill or in the oven, steam up some broccoli or toss together a salad, and it's still just as easy!
Give it a try and let me know what you think!