Make the sandwiches with 2 sliced ham and 1 slice cheese. Place in a 9x13  baking dish that has been sprayed with cooking oil spray. Beat eggs with milk and mustard. Pour milk mixture over the sandwichesand let stand for 4 hours or overnight in the fridge. Bake at 350 degrees for 1 hour or until custard is set and brown on top. serve hot or room temp.

You can change the meat or cheese to anything you like. A real good lunch change. I usually serve this with a tossed salad or with chips