Butter 9×13 glass dish.
Spread bread cubes, then add sausage, mushrooms, onion and green pepper. Top with cheeses.
Combine eggs, milk, salt, dry mustard and mayonnaise and stir until mixed; pour over other ingredients. Cover and refrigerate overnight.
Bake uncovered at 325 for one hour.
(May need to cover last few minutes to prevent cheese from browning.)
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