Sausage & hash brown casserole

Had this for breakfast. Again, forgot to document my work. This was so simple, just took some time in the oven. I got the recipe from

1 lb cooked Italian sausage
1 yellow onion, chopped/sautéed
7 eggs
1/2 c milk
20 oz diced, frozen hash browns
8 oz shredded cheese
Salt and pepper to taste

Preheat oven to 350F. Prepare sausage and onions. Mix together all ingredients in large bowl and dump in a greased 9×13 pan. Bake for 35 min, then add cheese and bake another 8 min. Let sit 15 min before serving.