Creating the Cheesy Sausage Breakfast Casserole is straightforward when you follow these steps:

1. Preheat Oven: Preheat your oven to 350°F (175°C).
2. Cook Sausage: In a skillet over medium heat, cook the breakfast sausage until browned, breaking it up as it cooks. Drain excess fat.
3. Prepare Egg Mixture: In a large bowl, whisk together the eggs, milk, salt, pepper, garlic powder, and onion powder until well combined.
4. Combine Ingredients: In a greased baking dish, layer the cooked sausage, bread cubes, and diced vegetables (if using).
5. Add Cheese: Sprinkle the shredded cheddar cheese evenly over the top of the layered mixture.
6. Pour Egg Mixture: Pour the egg mixture evenly over all the ingredients in the baking dish, making sure everything is soaked.
7. Rest: Allow the mixture to rest for about 10-15 minutes to let the bread absorb the egg mixture.
8. Bake: Bake in the preheated oven for 35-40 minutes, or until the eggs are set and lightly golden.
9. Cool: Once done, remove from the oven and let it cool for about 10-15 minutes before cutting.
10. Serve: Cut into squares and serve warm, garnished with fresh herbs if desired.

By carefully following these steps, you’ll have a delicious dish that your loved ones will rave about!