1 1/2 lbs. pork sausage links
4 eggs, beaten
2 1/2 c. milk
1/4 tsp. dry mustard
3 c. plain croutons
2 1/2 c. 910 oz.) shredded Cheddar cheese
1 (10 3/4 oz.) can cream of mushroom soup, undiluted
1 (2 1/2 oz.) jar sliced mushrooms, drained
2/3 c. milk

Cut each sausage link into 4 pieces. Cook until brown; drain and set aside. Combine next 3 ingredients. Layer croutons, cheese, sausage, and egg mixture in a buttered 13 x 9 x 2 inch baking dish. Cover and chill overnight. Combine remaining ingredients; stir well and spread over top of casserole. Bake, uncovered, at 300 degrees for 1 1/2 hours. Yield: 8 to 10 servings.