Breakfast Casserole

This is so easy and very yummy!  

6 slices white bread cut into cubes
1 pound sausage, cooked, crumbled and drained
1 cup shredded sharp cheddar cheese
6 eggs
2 cups milk
1 teaspoon salt
1 teaspoon dry mustard

Put the first three ingredients in a buttered 7x11 casserole dish. Combine the eggs, milk, salt, and dry mustard and pour over the mixture in the casserole dish. Cover the dish and refrigerate overnight. Bake for 1 hour or longer, until puffy and golden brown at 350. Serve hot.