Preheat oven to 325 degrees.
Spray a 2 quart or 9x13 baking dish with nonstick cooking spray or butter it. Place the hash brown potatoes in the bottom of the casserole dish, breaking them to form if need be. Combine the cooked sausage with the chopped green onions & spread over the hash brown patties. Top with the shredded cheese.
In a large bowl, whisk together the eggs, gravy mix, water, & milk and salt and pepper. Pour the mixture over the hashbrown/sausage.
Arrange the bread pieces over top. Drizzle the bread with melted butter. Bake for 50-60 minutes, or until the eggs are set in the center. Let rest for 10 minutes before digging in.