Hash Brown Casserole

It was at a diner in. . . .Florida maybe?, where I had a life altering breakfast.  You know the type - you take a bite and think, "OMFG, why doesn't EVERYONE serve this EVERYWHERE?!"  It was basically all my brekkie favorites - eggs, cheese, meat and hashbrowns - cooked into a casserole dish.  Soft, ooey, gooey, flavorful HEAVEN.
I've only dreamed of it for oh, four years or so and have yet to try to make it on my own.  Between Paula Deen (my arteries slammed shut just thinking of what her version would be like), Cooks.com, and everywhere else  you can find a recipe, you're sure to find some variation (bacon!  sausage!  ham!  potato chips?!) you'll be dying to try.  I'm tempted to give it a whirl now because I just had my step grandmother's amazing scrambled egg Christmas morning casserole and thought I could try out the hashbrown version for a hungover January 1st.

Breakfast Casserole
3 cups of potatoes O'Brien, thawed  (you can use the cubed type hash browns if you can't find O'Briens)
1/2 cup milk - I used heavy whipping cream because I had it and also because wow, but I wouldn't normally!
5 eggs
1/3 cup chopped onion (use 1/2 cup if you're not using O'Briens)
1 1/2 cups of shredded cheese (I have a swiss and Gruyere mixture ready to go, but use your fave)
sliced ham, cooked & crumbled bacon, or cooked & crumbled sausage
breadcrumbs
salt & pepper

Beat the eggs and milk and season with salt & pepper (feel free to try paprika, onion or garlic powder, or celery salt here as well).  Stir in onions, 1 cup of cheese and the ham or sausage (the bacon I'd keep to crumble on top so it stays crispy, but you could stir it in if you'd prefer).
Put the hash browns into a baking or pie dish and pour the egg mixture over the top.
Sprinkle with the rest of the cheese and put into oven.  Turn heat on to 350 and allow to cook for 35 minutes or until set.  About five minutes before it's done, add the bread crumbs and bacon to make a nice crispy crust.