1/2 cup flour
1 teaspoon salt
1/8 teaspoon pepper
1 teaspoon dry mustard
1 teaspoon Worcestershire sauce
3 cups milk
2/3 cup butter or margarine
1/2 medium onion, chopped
1/4 pound sharp Cheddar cheese, grated
1 pound ham, cubed
1-1/2 cups bread crumbs
1/4 cup butter or margarine, melted
Cook vegetables, drain. Mix flour, seasonings, and 2 cups of the milk. Heat remaining milk; add flour mixture and butter. Cook until thick. Add onion and cheese; heat until cheese melts. Add ham and vegetables. Mix crumbs with melted butter; sprinkle over top of casserole. Bake at 350 degrees for 40 minutes.