Beat the egg, milk, vanilla, and nutmeg together in a flat dish such as a soup plate or pie pan, that will accomodate the bread and make it easy to remove the bread once it's wet. Add 1 slice of bread at a time, turning so that both sides are coated and absorb some of the liquid. Meanwhile heat butter on a large griddle or skillet to 400 brown the bread briefly on each side making sure the center is cooked. Serve with syrup, honey, cooked or raw fruit, or plain.