Christmas Morning Breakfast Casserole


1 pound breakfast sausage
1 teaspoon mustard powder
1/2 teaspoon salt
4 eggs, beaten
2 cups milk
6 slices white bread, toasted and cut into cubes
8 ounces mild cheddar cheese, shredded
Crumble breakfast sausage into medium skillet.  Cook over medium heat until evenly browned; drain.
In a medium bowl, mix together mustard powder, salt, eggs, and milk.  Add the sausage, bread cubes, and cheese.  Stir to coat evenly.  Pour into a greased 9x13 inch baking dish. 
Cover and chill in the refrigerator for 8 hours, or overnight.
Preheat oven to 350 degrees F (175 degrees C).
Cover and bake 45 to 60 minutes.  Uncover and reduce temperature to 325 degrees F (165 degrees C).  Bake for an additional 30 minutes, or until set.