turn oven to325 f.spray 3 quart baking dish with cooking spray12 by 9 in baking dish.
Trim crust from bread. Arrange 6 slices in baking dish. layer ham, cheese an onions on bread in dish. Cut remaining slices diagonally in half, arrange on onions.
in med bowl, beat egg, milk, mustard with fork or wire wisk, pour evenly over bread.
bake uncovered for 1 hour or until center is set an bread is golden. let stand 10 min ummmmmmmm
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