In a small bowl, beat eggs and milk.
Arrange cheese and apple slices on 2 slices of raisin bread and top with remaining bread. Press down firmly on each sandwich.
Carefully dip each sandwich in egg mixture and let it soak up egg mixture on both sides.
Heat a non-stick frying pan over medium heat. Melt butter and cook sandwiches for about 3 minutes per side, or until golden brown.