In bottom of 9x14 Casserole put in the bread, ham, cheese, mushrooms and olives.
Mix together- flour, mustard and butter.
To flour mixture add eggs and milk.
Pour liquid over top of ingredients in pan.
Let stand overnight in refrigerator.
Remove from refrigerator about 2 hours before baking.
Preheat oven to 350 degrees.
Bake for 1 hour.
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