Crumble sausage into a medium skillet. Cook over medium heat until evenly brown; drain.

Sausage crumbled into a skillet, cooking until evenly brown.

In a medium bowl, mix together mustard powder, salt, eggs and milk. Add the sausage, bread cubes, and cheese, and stir to coat evenly.

All ingredients mixed together in a large mixing bowl.

Pour into a greased 9x13 inch baking dish. Cover, and chill in the refrigerator for 8 hours, or overnight.

an overhead view of an unbaked sausage breakfast casserole being poured into a red 9x13 casserole dish

Preheat oven to 350 degrees F . Cover, and bake 45 to 60 minutes.

Uncover, and reduce temperature to 325 degrees F. Bake for an additional 30 minutes, or until set

Cover and bake casserole until set.

Serve hot and enjoy!