Country Style Breakfast Casserole

8 oz. Link sausage or 1 lb ground sausage
2 lb frozen hash browns
2 cups milk
6 eggs
1/2 tsp dry mustard
1/4 tsp pepper
1  1/2 cups grated cheddar cheese
1/4  cup grated parmesan cheese
2 Tbls snipped green onion

Preheat oven to 350, lightly spray 9 X 13 pan, saute sausage until browned, arrange sausage in single layer in baking pan. Top with hash browns. Mix egg, milk and seasonings and pour over hash browns. Sprinkle cheese on top and green onions.  Bake for 1 hr or until set. After baking let set 10 min. before serving.
*To prepare the night before* Cover unbaked dish with plastic wrap and refrigerate over night. Place cold casserole in cold oven. Set oven at 350 and bake for 1 hr & 15 min. or until set.