Cheesy Sausage & Potato Breakfast Casserole

I made this on Christmas morning and it is super good!

Cheesy Potato Breakfast Casserole

1 pound breakfast sausage in a roll, cooked (I used Jimmy Dean Sage)
1 yellow onion, chopped, sauteed in the sausage when the sausage is about done
7 eggs
1/2 cup milk
20 ounce bag frozen Ore-Ida Diced Hash Browns, defrosted in the microwave.  Mine took about 8 minutes and were nice and warm.  I like to pre-cook them if not they still have a raw bite to them.
2 cups of shredded cheddar, mild or sharp
Salt & Pepper, to taste

Instructions:

Preheat oven to 350.  Spray a 9 x 13 with non-stick spray.  Set aside.

Prepare sausage and onions.

In a large mixing bowl, combine all ingredients, including sausage and onions.  Pour into prepared casserole dish.  Reserve roughly one cup of the cheese for topping.

Bake for 35 minutes.  Remove from oven and top with reserved cheese.  Return to oven for 10 minutes.

Allow casserole to cool for 15-20 minutes.  Serve and enjoy!

I didn't take any other pictures of the inside of the casserole, just totally forgot.  The breakfast in the pie dish is my favorite Ham & Swiss pie.