Preheat oven to 350 degrees.
In a large skillet, cook sausage until no longer pink. Drain fat.
Add hash browns to skillet and cook until lightly brown. Place hash browns in bottom of lightly greased 9x13-inch pan. Top with sausage and cheese.
Whisk together eggs, salt, pepper, garlic powder, onion powder and milk. Pour over hash brown mixture.
**Cover and refrigerate at this point if baking later.**
Bake for 35-40 minutes.