Preheat oven to 350.
Spray a 9"x13" baking dish with non-stick cooking spray.
In large bowl add your tater tots and shredded cheese.
In large skillet add your sausage and onion and cook until sausage is no longer pink and onions are tender, drain then add to your tater tots. Mix sausage, onions, tots & cheese together- spread in greased baking dish.
In large bowl whisk together milk, eggs, onion powder, garlic powder, cayenne powder, salt and pepper.
Pour egg mixture over the tater tots and bake in oven for 60 minutes or until eggs are set.
Remove from oven and sprinkle with diced green onions if desired.