This is an easy to prepare, tasty dish using simple ingredients...my family loves it! If you can't find the hash browns with onions already in with the potatoes, just saute 1/3 cup chopped onion and add that to the mix before baking. While I use a 4 cheese blend, cheddar cheese alone would be fine also...the cooked cheese makes a delicious crust in the casserole. Frozen hash browns would work too just thaw them before adding to the mix. Perfect for a brunch, we also love it for supper too!