Crumble sausage into a medium skillet. Cook over medium heat until evenly brown, drain.
In a medium bowl, mix together mustard powder, salt, eggs and milk. Add the sausage, bread cubes and cheese, and stir to coat evenly. Pour into a greased 9×13 inch baking dish. Cover and chill in the refrigerator for 8 hours or overnight.
Preheat oven to 350 degrees.
Cover, and bake for 45-60 minutes. Uncover, and reduce temperature to 325 degrees and bake for an additional 30 minutes or until set.
Enjoy!
Recipe by Sports Mom Survival Guide at https://www.sportsmomsurvivalguide.com/breakfast-casserole/