Sausage Breakfast Casserole

This is a great breakfast casserole (we had it for dinner the other night though). It would be a great Christmas morning recipe. I just made it up but it turned out really yummy.

1 pkg frozen Hash browns (shredded kind), thawed out
1 pkg frozen peppers/onions combo (some brands have a few other things in it- like a few red pepper and/or a little bit of celery), thawed out
12 eggs
2 1/2 cups shredded cheddar cheese
1 lb sage sausage (the kind in the roll- like ground beef) cook and crumble up
2 tsp salt
1/2 tsp pepper
2 tsp Dry mustard
1 cup half n half (or you can use milk)

Dump hash browns in a greased 9x13 pan. Dump peppers/onions combo, and cooked sausage over potatoes and 1 1/2 cups cheese. Stir around with a fork to incorporate all of it together.
Mix eggs, half n half, salt, pepper, and dry mustard. Wisk until combined. Pour over veggies/sausage mixture. Top with the rest of the cheese (1 cup).
Cook at 350 for about an hour.
I covered it for 45 min. and uncovered it for the rest. Use your best judgment- however crusty you want your cheese to determine doneness.