Easy Brunch Casserole

1 pkg. croutons (any flavor)
2 cups shredded cheddar cheese
2 lbs. bulk sausage
6 eggs
3/4 tsp. reg. mustard
1 can condensed cream of mushroom soup or potato soup
1 sm can mushrooms
2 1/2 cups milk

Place croutons in greased 9x13-inch pan. Put grated cheese over croutons. Brown sausage and drain. Sprinkle over top of cheese. Beat eggs and mix with mustard, milk, soup, and mushrooms. Pour over sausage and bake, covered with foil at 300 degrees for 1 1/2 hours. May be prepared the night before, refrigerated and baked the following day.