1. Preheat oven to 400 degrees. Cook sausage an onions in large skillet until cooked through and onions are translucent, drain.2. With cooking spray, grease a large baking dish, 13x9. Pour in sausage, hash browns, and 1 1/2 cups of cheese and mix well.3. In a large mixing bowl, stir Bisquick, milk, salt, pepper, and eggs together until well blended. Pour over the sausage mixture in the baking dish.4. Bake for 40 to 45 minutes uncovered or until the egg mixture is done in the middle. Sprinkle with 1/2 cup cheese and put back into the hot oven for 1 minute or until the cheese is melted. Sprinkle with green onions and enjoy!