Coat 9x13-inch glass dish with vegetable spray. In large bowl, whisk eggs lightly, add cubed bread; mix in salt, pepper, dry mustard, and milk; stir in lobster and cheese. Pour into dish, cover and refrigerate overnight.
In the morning: Preheat oven to 350 degrees F. Bake uncovered for 50 to 60 minutes, or until golden brown. Serve hot.
Crabmeat may be substituted for lobster.