Place bread cubes in greased 9x13 inch pan. Sprinkle with cheese, and add sausage. Blend eggs, 2 cups milk, and mustard. Pour over ingredients in pan. Refrigerate several hours or overnight. Blend soup and 1/2 cup milk; pour over top just before baking. Bake at 300 degrees F for 1 1/2 hours.
By Robin from Washington, IA
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In 1 qt. saucepan, make cheese sauce by melting butter. Blend in flour and cook for 1 minute. Gradually stir in milk. Cook until thick.