Creating your Sausage Egg and Cheese Breakfast Casserole is simple when you follow these steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C) and grease a 9×13 inch baking dish.
2. Brown the Sausage: In a skillet over medium heat, cook the sausage until browned and fully cooked. Drain any excess grease and set aside.
3. Whisk Eggs: In a large bowl, whisk together the eggs, milk, salt, pepper, garlic powder, and onion powder until well blended.
4. Combine Ingredients: In the greased baking dish, place the cubed bread, cooked sausage, and 1 cup of cheddar cheese. Pour the egg mixture over the top, ensuring even distribution.
5. Add Remaining Cheese: Sprinkle the remaining cheese on top, covering the entire surface.
6. Bake: Place in the preheated oven and bake for 35-40 minutes, or until the casserole is set and the top is golden brown.
7. Cool: Once done, remove from the oven and let it rest for 10 minutes before slicing.
8. Serve: Garnish with chopped green onions if desired, and enjoy!

These simple instructions will guide you to create an amazing and satisfying breakfast casserole that everyone will love.