Brunch Casserole

6 beaten eggs 
20 slices of bread - cubed
4 cups milk 
1 lb. grated sharp cheddar cheese
1 1/2 stick butter 
1 1/2 tsp. salt
1/2 tsp. dry mustard 
1 lb. cooked drained sausage

Mix all the ingredients in a large bowl and put in buttered pan. Chill over night. Bake 1 hour at 350 degrees.