Creating the Make-Ahead Sausage Breakfast Casserole is straightforward if you follow these steps:

1. Cook the Sausage: In a large skillet over medium heat, cook the crumbled sausage until it is browned and fully cooked. Drain excess grease and set aside.
2. Whisk Eggs: In a large mixing bowl, whisk together the eggs, milk, salt, pepper, onion powder, and garlic powder until well combined.
3. Combine Ingredients: In a large bowl, combine the cooked sausage, cubed bread, diced bell peppers, and onions. Mix well to ensure the sausage and vegetables are evenly distributed.
4. Add Egg Mixture: Pour the egg mixture over the bread and sausage mixture. Gently fold until everything is well coated.
5. Add Cheese: Fold in the shredded cheddar cheese, reserving a small amount for topping.
6. Transfer to Baking Dish: Grease a 9×13 inch baking dish and pour the mixture into it. Spread evenly and sprinkle the reserved cheese on top.
7. Chill: Cover the dish with plastic wrap and refrigerate for at least 4 hours or overnight. This allows the bread to absorb the egg mixture.
8. Preheat Oven: When ready to bake, preheat your oven to 350°F (175°C).
9. Bake: Remove the plastic wrap and bake the casserole for 45 minutes or until the top is golden brown and the center is set.
10. Cool and Serve: Allow the casserole to cool for a few minutes before slicing. Garnish with fresh herbs if desired.

These steps will guide you effortlessly in creating this incredible breakfast casserole that everyone will love!