Beat the eggs in a bowl, cream, vanilla, cinnamon, nutmeg and salt. Place the slices in a baking dish large enough to line up on one layer. Pour over top with egg mixture and allow to soak for about 5 minutes. Turn the slices and leave for another 5 minutes. Heat the butter and the oil in a pan and fry the slices until golden on both sides. Remove and leave them on a wire rack or towel to drain the fat. Serve hot.