Egg, Sausage and Cheese Breakfast Casserole

10 slices of white bread
1 1/2 lb of sausage cut into bite size pieces
2 cups cheddar or mozzarella
8 eggs beaten
1 cup milk
3/4 tsp dry mustard
1/2 tsp salt
1/2 tsp pepper
Grease 9x13 pan. Cube bread and put in the bottom of the pan. cover with sausage and cheese. Beat eggs with 1 cup milk, mustard, salt & pepper. Pour over bread, meat and cheese. Put plastic wrap over dish and refrigerate overnight.
In the morning mix mushroom and 1 cup milk, pour over casserole.
1 can cream of mushroom
1 cup milk
Bake 350 uncovered for 40-50 mins or until toothpick is clean.