Breakfast Casserole

Directions

1. 1
   Grease a 9 x 13-inch baking dish. Arrange croutons in single layer in bottom of dish.
2. 2
   Sprinkle cheese and mushrooms evenly over croutons. Cook sausage in a large skillet, breaking into chunks, until browned, about 15 minutes.
3. 3
   Drain thoroughly. Place sausage over cheese and mushrooms. Beat eggs, milk, soup and mustard.
4. 4
   Pour over sausage.
5. 5
   Bake until set, about 1 1/2 hours at 300°.
6. 6
   Serve hot.
7. 7
   This can be prepared ahead and refrigerated overnight.