Brown the sausage
First of all, you are required to brown the sausage in a skillet. Make sure that you crumble it while cooking and also add poultry seasoning.
Toast the bread cubes
Preheat your oven to 450 degrees F and toast the bread cubes on a baking sheet for a few minutes. Meanwhile, using a non-stick spray, you need to spray a 9 by 13 inch pan and put it aside.
Mix the ingredients
Grab a large mixing bowl before adding the sausage, toasted bread, cheese, mustard powder and salt in it before you mix them nicely.
You can now beat the eggs in a small bowl. In order to mix them well, you can add a small quantity of water.
Pour the beaten eggs over the sausage mixture before you mix all these ingredients thoroughly. Make sure that everything is coated with eggs before you transfer the mixture to the sprayed baking pan.
Place the mixture in the refrigerator
Having poured the mixture in the baking pan, you are required to cover it with foil before you place it in the refrigerator so that it can be made in the morning.
Bake the breakfast casserole
The next morning, you need to preheat the oven to 350 degrees F and bake the breakfast casserole for about 40 minutes. Do not remove the foil from the dish even when it is getting baked. After 40 minutes, you should remove the foil from the dish and allow the casserole to be baked for another 20 minutes.