Creating your Easy Breakfast Casserole is easy with these simple steps:

1. Preheat the Oven: Start by preheating your oven to 350°F (175°C).
2. Prepare the Baking Dish: Grease a 9×13 inch baking dish with cooking spray or butter to prevent sticking.
3. Whisk Eggs: In a large bowl, whisk together the eggs, milk, salt, pepper, garlic powder, and onion powder until well combined.
4. Add Cheese: Stir in the shredded cheese, mixing thoroughly.
5. Incorporate Veggies: Fold in the diced vegetables and cooked sausage or bacon, if using.
6. Combine with Bread: Gently mix in the cubed bread until everything is evenly coated with the egg mixture.
7. Transfer to Baking Dish: Pour the entire mixture into the prepared baking dish, spreading it out evenly.
8. Bake: Place in the preheated oven and bake for 35-40 minutes or until the top is golden brown and a knife inserted in the center comes out clean.
9. Cool Slightly: Once done, allow it to cool for about 5-10 minutes before slicing.
10. Serve: Cut into squares and serve warm.

These straightforward steps ensure you can whip up an amazing breakfast casserole without breaking a sweat!